231517 is composite number. 19 is a prime number.
19 is prime.
No, 19 is a prime number because it can only be multiplied by 2 factors which are 1 and 19. A composite number needs 3 factors.
It is divisible by 19, so it is composite.
19 is a prime number.
38 is a composite number
21 is composite.
19 is prime the only numebr that is neither prime or composite is 1
19 is a prime number
15 is composite number 17, 19 and 23 are prime numbers.
No, 19 is prime. A composite number needs to have 3 or more factors. 19 has only 2 factors, 1 and itself, which makes it prime.
13 and 19 are prime. 33 and 45 are composite.