To determine if 1639 is a prime number or a composite number, we simply look at the factors for 1639.
If the factors of 1639 are only 1639 and 1, then we know that 1639 is a prime number. Otherwise, 1639 is a composite number.
To explain better, if 1639 is only divisible by 1 and 1639, then it is a prime number, and if 1639 is divisible by more than 1639 and 1, then it is a composite number.
The factors of 1639 are as follows:
1, 11, 149, 1639
Therefore, since 1639 is divisible by more than one and itself, the answer to the
question "Is 1639 prime or composite?" is highlighted in blue below.
composite
Is 1640 prime or composite?
OK. Now you know that 1639 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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