21, 51, 81, 91.
51 is composite.
51 composite, 61 prime.
51 is composite.
91 is the only composite factor of 91. 7 and 13 are prime.
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, 51, 81, 91.
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.