# Prime Number | Questions and Answers ### Define prime number.

Answer: The definition of prime number: “A number which has only two factors is called a prime number. The two factors are 1 and the number itself.”

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For example:

2 has its factors 1 and the number 2 itself. So, 2 is a prime number.

3 has its factors 1 and the number 3 itself. So, 3 is a prime number.

5 has its factors 1 and the number 5 itself. So, 5 is a prime number.

7 has its factors 1 and the number 7 itself. So, 7 is a prime number.

11 has its factors 1 and the number 11 itself. So, 11 is a prime number.

13 has its factors 1 and the number 13 itself. So, 13 is a prime number.

17 has its factors 1 and the number 17 itself. So, 17 is a prime number.

19 has its factors 1 and the number 19 itself. So, 19 is a prime number.

etc.

### What is the meaning of prime number?

Answer: The meaning of prime number is such a number which is perfect by itself. It can not be the product of any two or more whole numbers. The only factors of a prime number are 1 and the number itself.

For example, 23 can not be the product of any two or more whole numbers. The only factors of 23 are 1 and the number 23 itself, i.e. 23 = 1 × 23 and no more. So, 23 is a prime number.

### Which is the smallest prime number?

Answer: The smallest prime number is 2.

### Which is the largest prime number?

Answer: The largest prime number known till date (June 2021) is 282,589,933 - 1, a number with 24,862,048 digits in the decimal number system. It was found via a computer volunteered by Patrick Laroche of GIMPS (Great Internet Mersenne Prime Search) in 2018.

### Which is the first prime number?

Answer: The first prime number is 2.

### Which is the smallest odd prime number?

Answer: The smallest odd prime number is 3.

### Which is the largest 2 digit prime number?

Answer: The largest 2 digit prime number is 97.

### Which is the only even prime number?

Answer: The only even prime number is 2.

### What are the odd prime numbers?

Answer: Except 2 other all are odd prime numbers.

### Are there negative prime numbers?

Answer: No, only the positive integer can be a prime. So, there are not negative prime numbers.

### Is 0 a prime number?

Answer: No, 0 is neither prime nor composite.

### Is 1 prime number?

Answer: No, 1 is neither prime nor composite.

### Is 2 prime number?

Answer: Yes, 2 is a prime number.

### Is 3 prime number?

Answer: Yes, 3 is a prime number.

### Is 4 prime number?

Answer: No, 4 is not a prime number.

### Is 5 prime number?

Answer: Yes, 5 is a prime number.

### Is 6 a prime number?

Answer: No, 6 is not a prime number.

### Is 7 prime number?

Answer: Yes, 7 is a prime number.

### Is 8 a prime number?

Answer: No, 8 is not a prime number.

### 9 is a prime number?

Answer: No, 9 is not a prime number.

### Is 11 prime number?

Answer: Yes, 11 is a prime number.

### Is 13 prime number?

Answer: Yes, 13 is a prime number.

### Is 17 prime number?

Answer: Yes, 17 is a prime number.

### Is 19 prime number?

Answer: Yes, 19 is a prime number.

### Is 23 prime number?

Answer: 23 is a prime number.

### Is 29 prime number?

Answer: Yes, 29 is a prime number.

### Is 31 prime number?

Answer: Yes, 31 is a prime number.

### Is 37 prime number?

Answer: Yes, 37 is a prime number.

### Is 41 prime number?

Answer: Yes, 41 is a prime number.

### Is 43 prime number?

Answer: Yes, 43 is a prime number.

### Is 47 prime number?

Answer: Yes, 47 is a prime number.

### Is 49 prime number?

Answer: No, 49 is not a prime number.

### 51 is a prime number?

Answer: No, 51 is not a prime number.

### 57 is a prime number?

Answer: No, 57 is not a prime number.

### Is 71 prime number?

Answer: Yes, 71 is a prime number.

### 87 is a prime number?

Answer: No, 87 is not a prime number.

### 91 is a prime number?

Answer: No, 91 is not a prime number.

### Is 97 prime number?

Answer: Yes, 97 is a prime number.

### Is 101 prime number?

Answer: Yes, 101 is a prime number.

### What is the next prime number after 7?

Answer: The next prime number after 7 is 11.

### What is the prime number immediately after 50?

Answer: The prime number immediately after 50 is 53.

### Why is 1 not a prime number?

Answer: The definition of prime number says that “A number which has only two factors is called a prime number”. 1 has only one factor that is 1 itself, so 1 is not a prime number.

### Why is 2 a prime number?

Answer: The definition of prime number says that “A number which has only two factors is called a prime number”. 2 has only two factors that is 1 and 2 itself, so 2 is a prime number.

### List the prime numbers less than 10.

Answer: The prime numbers less than 10 are: 2, 3, 5, and 7.

### List the first 5 prime numbers.

Answer: The first 5 prime numbers are: 2, 3, 5, 7, and 11.

### List the first 10 prime numbers.

Answer: The first 10 prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29.

### List the first 20 prime numbers.

Answer: The first 20 prime numbers are: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, and 71.

### List the prime numbers from 1 to 50.

Answer: Here is the list of prime numbers from 1 to 100: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, and 47.

### List the prime numbers from 1 to 100.

Answer: Here is the list of prime numbers from 1 to 100: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, and 97.

### List the prime numbers from 1 to 1000.

Answer: Here is the list of prime numbers from 1 to 100: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439, 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571, 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691, 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829, 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977, 983, 991, 997.

### What are twin prime numbers?

Answer: Two prime numbers are said to be twin primes if their difference is 2.

For example:

3 and 5 are two prime numbers and their difference is 2. So, 3 and 5 are twin primes.

5 and 7 are two prime numbers and their difference is 2. So, 5 and 7 are twin primes.

11 and 13 are two prime numbers and their difference is 2. So, 11 and 13 are twin primes.

17 and 19 are two prime numbers and their difference is 2. So, 17 and 19 are twin primes.

41 and 43 are two prime numbers and their difference is 2. So, 41 and 43 are twin primes.

59 and 61 are two prime numbers and their difference is 2. So, 59 and 61 are twin primes.

71 and 73 are two prime numbers and their difference is 2. So, 71 and 73 are twin primes.

etc.

### What is co prime number?

Answer: Co prime number is a set of two or more than two numbers having a single common factor 1. They are also called relatively prime or mutually prime numbers.

For example:

4 and 9 have their single common factor 1, so 4 and 9 are co prime numbers.

10 and 13 have their single common factor 1, so 10 and 13 are co prime numbers.

15 and 28 have their single common factor 1, so 15 and 28 are co prime numbers.

16 and 25 have their single common factor 1, so 16 and 25 are co prime numbers.

20 and 21 have their single common factor 1, so 20 and 21 are co prime numbers.

25 and 26 have their single common factor 1, so 25 and 26 are co prime numbers.

5, 6, and 7 have their single common factor 1, so 5, 6, and 7 are co prime numbers.

12, 17, and 25 have their single common factor 1, so 12, 17, and 25 are co prime numbers.

15, 23, and 28 have their single common factor 1, so 15, 23, and 28 are co prime numbers.

etc.

### What are the co prime numbers between 1 to 50?

Answer: All the prime numbers from 1 to 50 including 1 are the co prime numbers. So, 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47 are co prime numbers between 1 to 50.

### What are the co prime numbers from 1 to 100?

Answer: All the prime numbers from 1 to 100 including 1 are the co prime numbers. So, 1, 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97 are co prime numbers from 1 to 100.

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