To determine if 665 is a prime number or a composite number, we simply look at the factors for 665.
If the factors of 665 are only 665 and 1, then we know that 665 is a prime number. Otherwise, 665 is a composite number.
To explain better, if 665 is only divisible by 1 and 665, then it is a prime number, and if 665 is divisible by more than 665 and 1, then it is a composite number.
The factors of 665 are as follows:
1, 5, 7, 19, 35, 95, 133, 665
Therefore, since 665 is divisible by more than one and itself, the answer to the
question "Is 665 prime or composite?" is highlighted in blue below.
composite
Is 666 prime or composite?
OK. Now you know that 665 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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