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15 is composite number 17, 19 and 23 are prime numbers.
No
15 has more than exactly two factors (1, 3, 5, and 15), therefore it is composite. 17, 19, and 23 each have exactly 2 factors (1 and the number itself), so they are primes.
56 + 17 = 73 The only factors of 73 are 1 and itself. It is a prime number, not a composite number.
It is prime