17, 23 and 31 are prime. 39 is not.
17, 23 and 31 are prime. 39 is not.
The two prime numbers immediately following 17 are 19 and 23.
3, 13, 17, 23 are prime numbers. The others are not.
23 is a prime number only divisable by 1 and 23.
17, 23 and 31 are prime. 39 is not.
17, 23 and 31 are prime. 39 is not.
The two prime numbers immediately following 17 are 19 and 23.
15 is composite number 17, 19 and 23 are prime numbers.
3, 13, 17, 23 are prime numbers. The others are not.
23 is a prime number only divisable by 1 and 23.
51 is not a prime number: 3x17=51
39
13
51 is composite number
Any number that has only two factors which are itself and one is a prime number as in the following:- 2 3 5 7 11 13 17 19 23 29 .... etc
A prime number has only two factors which are itself and one as in the following examples: 2, 3, 5, 7, 11, 13, 17, 19, 23 .... etc