Best Answer

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?

Q: Which number is not a composite number 13-63-61 or 31?

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93 is composite.

63 is composite.

31 is prime.

31 is prime.

51 is composite.

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93 is composite.

63 is composite.

39 is a composite number 1 is neither prime nor composite number 31 and 41 are prime numbers.

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No, it is a prime number.

31 and 61 are prime, the rest composite.

31 is prime.

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91 is composite.