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31 is a Prime number because its only factors are 1 and itself.

91 has factors other than 1 and itself, so it is not a prime number. Its factors are 1, 7, 13, and 91. Therefore, it is a composite number.

Q: Which of 31 or 91 is a composite number?

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91 is a composite number. This is because composite numbers are any number that has another factor besides one and itself. Therefore, since 7 and 13 are factors of 91 that makes it a composite number.

91 is not a prime number. 91 is a composite number having the factors 1, 7, 13, and 91.

Only 91 is the prime number, 57 is a composite number because it is divisible by 3. ------------------------------- 57 and 91 are both composite. 57 = 19*3, and 91 = 13*7.

31 and 61 are prime, the rest composite.

41 is prime. 51 is composite. 51=3 x 17 . 71 is prime. 81 is composite. 92 91 is composite. 91 = 7 × 13

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91 is composite.

The only composite number in this list is 91. The others are prime numbers.

91 is a Composite Number.

91 is a composite number. This is because composite numbers are any number that has another factor besides one and itself. Therefore, since 7 and 13 are factors of 91 that makes it a composite number.

21 is divisible by 3 and 7, so it is composite. 91 is divisible by 7 and 13, so it is composite. 51 is divisible by 3 and 17. 31 is divisible by only 1 and itself, so it is the prime number.

91 is a composite number. The factors of 91 are 7 and 13

91 is a prime number.

91 is composite. The others are prime number

91=13x7

91 is composite.

91 is a composite number because it has more than 2 factors

91 is a composite number. The factors of 91 are 7 and 13.139 is a prime number13 is a prime number29 is a prime number.