To determine if 651 is a prime number or a composite number, we simply look at the factors for 651.
If the factors of 651 are only 651 and 1, then we know that 651 is a prime number. Otherwise, 651 is a composite number.
To explain better, if 651 is only divisible by 1 and 651, then it is a prime number, and if 651 is divisible by more than 651 and 1, then it is a composite number.
The factors of 651 are as follows:
1, 3, 7, 21, 31, 93, 217, 651
Therefore, since 651 is divisible by more than one and itself, the answer to the
question "Is 651 prime or composite?" is highlighted in blue below.
composite
Is 652 prime or composite?
OK. Now you know that 651 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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