To determine if 666 is a prime number or a composite number, we simply look at the factors for 666.
If the factors of 666 are only 666 and 1, then we know that 666 is a prime number. Otherwise, 666 is a composite number.
To explain better, if 666 is only divisible by 1 and 666, then it is a prime number, and if 666 is divisible by more than 666 and 1, then it is a composite number.
The factors of 666 are as follows:
1, 2, 3, 6, 9, 18, 37, 74, 111, 222, 333, 666
Therefore, since 666 is divisible by more than one and itself, the answer to the
question "Is 666 prime or composite?" is highlighted in blue below.
composite
Is 667 prime or composite?
OK. Now you know that 666 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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