To determine if 1644 is a prime number or a composite number, we simply look at the factors for 1644.
If the factors of 1644 are only 1644 and 1, then we know that 1644 is a prime number. Otherwise, 1644 is a composite number.
To explain better, if 1644 is only divisible by 1 and 1644, then it is a prime number, and if 1644 is divisible by more than 1644 and 1, then it is a composite number.
The factors of 1644 are as follows:
1, 2, 3, 4, 6, 12, 137, 274, 411, 548, 822, 1644
Therefore, since 1644 is divisible by more than one and itself, the answer to the
question "Is 1644 prime or composite?" is highlighted in blue below.
composite
Is 1645 prime or composite?
OK. Now you know that 1644 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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