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It is prime
17 is a prime number. Its only factors are 1 and 17.Prime.17 is a prime. This means that has no divisors other than itself and 1.
56 + 17 = 73 The only factors of 73 are 1 and itself. It is a prime number, not a composite number.
A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite. 17 is prime.
15 is composite number 17, 19 and 23 are prime numbers.