13 is a Prime number because it has only 2 factors which are itself and one
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91 is neither a prime nor a squared number. It is a composite having the prime factors 7 x 13.
13 is prime.
39 is a composite number because it has other factors aside from 1 and itself. The other factors of 39 are 3 and 13. 1 is neither prime nor composite.
3367 is a composite number. Its prime factors are 7, 13, 37
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?