To determine if 1680 is a prime number or a composite number, we simply look at the factors for 1680.
If the factors of 1680 are only 1680 and 1, then we know that 1680 is a prime number. Otherwise, 1680 is a composite number.
To explain better, if 1680 is only divisible by 1 and 1680, then it is a prime number, and if 1680 is divisible by more than 1680 and 1, then it is a composite number.
The factors of 1680 are as follows:
1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 15, 16, 20, 21, 24, 28, 30, 35, 40, 42, 48, 56, 60, 70, 80, 84, 105, 112, 120, 140, 168, 210, 240, 280, 336, 420, 560, 840, 1680
Therefore, since 1680 is divisible by more than one and itself, the answer to the
question "Is 1680 prime or composite?" is highlighted in blue below.
composite
Is 1681 prime or composite?
OK. Now you know that 1680 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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