51 is composite.
51 composite, 61 prime.
51 is composite.
91 is the only composite factor of 91. 7 and 13 are prime.
A person unfamiliar with prime numbers could mistake 51, 91, or any other composite number for a prime number if the person did not factor the number to make sure it had no other factors then 1 and itself.
both are composite numbers 51 is divisible by 1,3,17,51 and 91 by 1,7,13,91
No, 41, 51, 71, 81, and 91 are not prime numbers. A prime number is a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers. In this case, all the numbers listed can be divided by numbers other than 1 and themselves, making them composite numbers.
6, 9, 15, 28, 51, and 91.
61 and 71 are prime numbers the rest are composite numbers
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.
51 is composite.
3 x 17 = 51. It has factors other than 1 and itself. It is composite. 61 is prime. Its only factors are 1 and 61. 71 is prime. Its only factors are 1 and 71. 7 x 13 = 91. It is a composite number.
91 is a Composite Number.
51 is composite. Becasuse 17 x 3 = 51 It is two prime numbers multiplied together to make a composite.
91 is composite.
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.
51 is a composite number 3 x 17 = 51