Answer:
they're all prime
Step-by-step explanation:
Let's understand what prime and composite mean...
Prime means that the only factors of the number is only 1 and itself. Here are some examples:
13 = only 1 * 13
17 = only 1 * 17
13 and 17 are prime numbers.
Composite means that there are more than two factors of the number, including 1 and itself.
8 = 2 * 2 * 2 = 8 * 1 = 2 * 4
16 = 2 * 2 * 2 * 2
16 and 8 are composite numbers.
So, let's solve.
19 = 1 * 19, 19 doesn't have any other factors.
19 is prime.
73 = 73 * 1, 73 doesn't have any other factors.
73 is prime.
97 = 1 * 97, 97 doesn't have any other factors.
97 is prime.
