To determine if 1620 is a prime number or a composite number, we simply look at the factors for 1620.
If the factors of 1620 are only 1620 and 1, then we know that 1620 is a prime number. Otherwise, 1620 is a composite number.
To explain better, if 1620 is only divisible by 1 and 1620, then it is a prime number, and if 1620 is divisible by more than 1620 and 1, then it is a composite number.
The factors of 1620 are as follows:
1, 2, 3, 4, 5, 6, 9, 10, 12, 15, 18, 20, 27, 30, 36, 45, 54, 60, 81, 90, 108, 135, 162, 180, 270, 324, 405, 540, 810, 1620
Therefore, since 1620 is divisible by more than one and itself, the answer to the
question "Is 1620 prime or composite?" is highlighted in blue below.
composite
Is 1621 prime or composite?
OK. Now you know that 1620 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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