To determine if 66 is a prime number or a composite number, we simply look at the factors for 66.
If the factors of 66 are only 66 and 1, then we know that 66 is a prime number. Otherwise, 66 is a composite number.
To explain better, if 66 is only divisible by 1 and 66, then it is a prime number, and if 66 is divisible by more than 66 and 1, then it is a composite number.
The factors of 66 are as follows:
1, 2, 3, 6, 11, 22, 33, 66
Therefore, since 66 is divisible by more than one and itself, the answer to the
question "Is 66 prime or composite?" is highlighted in blue below.
composite
Is 67 prime or composite?
OK. Now you know that 66 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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