To determine if 1689 is a prime number or a composite number, we simply look at the factors for 1689.
If the factors of 1689 are only 1689 and 1, then we know that 1689 is a prime number. Otherwise, 1689 is a composite number.
To explain better, if 1689 is only divisible by 1 and 1689, then it is a prime number, and if 1689 is divisible by more than 1689 and 1, then it is a composite number.
The factors of 1689 are as follows:
1, 3, 563, 1689
Therefore, since 1689 is divisible by more than one and itself, the answer to the
question "Is 1689 prime or composite?" is highlighted in blue below.
composite
Is 1690 prime or composite?
OK. Now you know that 1689 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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