because it has two or more factors
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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