To determine if 85 is a prime number or a composite number, we simply look at the factors for 85.
If the factors of 85 are only 85 and 1, then we know that 85 is a prime number. Otherwise, 85 is a composite number.
To explain better, if 85 is only divisible by 1 and 85, then it is a prime number, and if 85 is divisible by more than 85 and 1, then it is a composite number.
The factors of 85 are as follows:
1, 5, 17, 85
Therefore, since 85 is divisible by more than one and itself, the answer to the
question "Is 85 prime or composite?" is highlighted in blue below.
composite
Is 86 prime or composite?
OK. Now you know that 85 is a composite number. Use our logic above and see if
you can figure out if the next number on our list is prime or composite before you check your answer.
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