To determine if 8639 is a prime number or a composite number, we simply look at the factors for 8639.
If the factors of 8639 are only 8639 and 1, then we know that 8639 is a prime number. Otherwise, 8639 is a composite number.
To explain better, if 8639 is only divisible by 1 and 8639, then it is a prime number, and if 8639 is divisible by more than 8639 and 1, then it is a composite number.
The factors of 8639 are as follows:
1, 53, 163, 8639
Therefore, since 8639 is divisible by more than one and itself, the answer to the
question "Is 8639 prime or composite?" is highlighted in blue below.
composite
Is 8640 prime or composite?
OK. Now you know that 8639 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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