15 is composite, because it can be written as the product of numbers besides itself and 1 (3 * 5 = 15). 17 is prime, because the only numbers that multiply to 17 are 1 and itself.
15 is composite number 17, 19 and 23 are prime numbers.
17, 19, 23, 29 and 31 are prime. 15, 21, 25 and 27 are composite..
It is prime
17 is a prime number.
17 is a prime.
17 is a prime number.
15 is composite.
1 is neither prime nor composite, but 17 is prime.
2 is a prime number and 15 is a composite number.
47 is a prime, the other two are composite.
prime
not prime composite 7 x 17 = 119