63 is composite.
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25 is the only composite number out of 31, 29, 25, 23.
403 is composite. It can be evenly divided by 13: 403/13 = 31.
13 prime 63 composite 61 prime 31 prime Well the question should have been either, Which one of these numbers is not a composite number? Or, Which one of these numbers is not a prime number?
93 is composite.
31 is prime.