To determine if 643 is a prime number or a composite number, we simply look at the factors for 643.
If the factors of 643 are only 643 and 1, then we know that 643 is a prime number. Otherwise, 643 is a composite number.
To explain better, if 643 is only divisible by 1 and 643, then it is a prime number, and if 643 is divisible by more than 643 and 1, then it is a composite number.
The factors of 643 are as follows:
1, 643
Therefore, since 643 is divisible by only one and itself, the answer to the
question "Is 643 prime or composite?" is highlighted in blue below.
prime
Is 644 prime or composite?
OK. Now you know that 643 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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