To determine if 648 is a prime number or a composite number, we simply look at the factors for 648.
If the factors of 648 are only 648 and 1, then we know that 648 is a prime number. Otherwise, 648 is a composite number.
To explain better, if 648 is only divisible by 1 and 648, then it is a prime number, and if 648 is divisible by more than 648 and 1, then it is a composite number.
The factors of 648 are as follows:
1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 27, 36, 54, 72, 81, 108, 162, 216, 324, 648
Therefore, since 648 is divisible by more than one and itself, the answer to the
question "Is 648 prime or composite?" is highlighted in blue below.
composite
Is 649 prime or composite?
OK. Now you know that 648 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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