To determine if 647 is a prime number or a composite number, we simply look at the factors for 647.
If the factors of 647 are only 647 and 1, then we know that 647 is a prime number. Otherwise, 647 is a composite number.
To explain better, if 647 is only divisible by 1 and 647, then it is a prime number, and if 647 is divisible by more than 647 and 1, then it is a composite number.
The factors of 647 are as follows:
1, 647
Therefore, since 647 is divisible by only one and itself, the answer to the
question "Is 647 prime or composite?" is highlighted in blue below.
prime
Is 648 prime or composite?
OK. Now you know that 647 is a prime 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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