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because it has two or more factors

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

How many whole numbers between 1 and 100 are 3 times a prime?

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


What is the LCM of 57 and 85?

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


Is 63 53 87 3 27 88 19 69 79 3235 1212 57 17 all prime numbers?

Prime


Prime numbers between 55 and 90?

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


Prime factorization of 87?

The Answer of 87 in prime numbers is 3,29


Why are 35 57 87 composite numbers?

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.


Are 87 and 57 composite numbers?

Yes, they are.


What prime numbers equal 87?

They are: 3*29 = 87


What are numbers are prime numbers found between 50-100?

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


What are all odd composite numbers 1 to 100?

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.


Are 87 and 100 relatively prime?

Both 87 and 100 are composite numbers.


What two prime numbers equal 87?

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.