Q: Why are 51 57 87 and 91 not prime numbers?

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11 numbers:6, 9, 15, 21, 33, 39, 51, 57, 69, 87 and 93.

Prime

The prime numers between 50 and 100 are 51, 53, 59, 61, 67, 71, 73, 79, 83, 87, 89, 91, and 97.

All prime numbers except for 2 are odd. The sum of any two odd numbers is even. Therefore, unless 85 is prime (it's not) or -2 is, (it's not) there aren't two prime numbers that will equal 87.

3*29

Related questions

11 numbers:6, 9, 15, 21, 33, 39, 51, 57, 69, 87 and 93.

The least common multiple of the numbers 51 and 87 is 1,479.

Prime

57 - 59 - 61 - 67 - 71 - 73 - 79 - 83 - 87 - 89

The Answer of 87 in prime numbers is 3,29

All numbers having more than two factors are composite numbers. Factors of 35 are 1, 5, 7, and 35. Factors of 57 are 1, 3, 19, and 57. Factors of 87 are 1, 3, 29, and 87. Since 35, 57, and 87 all have more than 2 factors, they are composite numbers.

Yes, they are.

They are: 3*29 = 87

The prime numers between 50 and 100 are 51, 53, 59, 61, 67, 71, 73, 79, 83, 87, 89, 91, and 97.

The odd composite numbers are 9, 15, 21, 25, 27, 33, 35, 39, 45, 49, 51, 55, 57, 63, 65, 69, 75, 81, 85, 87, 91, 93, 95, and 99.Composite numbers are those numbers that can be expressed as the product of any two integers greater than 1. So they are all numbers that are not prime numbers.9, 15, 21, 25, 27, 33, 35, 39, 45, 49,51, 55, 57, 63, 65, 69, 75, 77, 81, 85,87, 91, 93, 95, 99.

Both 87 and 100 are composite numbers.

All prime numbers except for 2 are odd. The sum of any two odd numbers is even. Therefore, unless 85 is prime (it's not) or -2 is, (it's not) there aren't two prime numbers that will equal 87.