To determine if 1638 is a prime number or a composite number, we simply look at the factors for 1638.
If the factors of 1638 are only 1638 and 1, then we know that 1638 is a prime number. Otherwise, 1638 is a composite number.
To explain better, if 1638 is only divisible by 1 and 1638, then it is a prime number, and if 1638 is divisible by more than 1638 and 1, then it is a composite number.
The factors of 1638 are as follows:
1, 2, 3, 6, 7, 9, 13, 14, 18, 21, 26, 39, 42, 63, 78, 91, 117, 126, 182, 234, 273, 546, 819, 1638
Therefore, since 1638 is divisible by more than one and itself, the answer to the
question "Is 1638 prime or composite?" is highlighted in blue below.
composite
Is 1639 prime or composite?
OK. Now you know that 1638 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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