To determine if 4020 is a prime number or a composite number, we simply look at the factors for 4020.
If the factors of 4020 are only 4020 and 1, then we know that 4020 is a prime number. Otherwise, 4020 is a composite number.
To explain better, if 4020 is only divisible by 1 and 4020, then it is a prime number, and if 4020 is divisible by more than 4020 and 1, then it is a composite number.
The factors of 4020 are as follows:
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60, 67, 134, 201, 268, 335, 402, 670, 804, 1005, 1340, 2010, 4020
Therefore, since 4020 is divisible by more than one and itself, the answer to the
question "Is 4020 prime or composite?" is highlighted in blue below.
composite
Is 4021 prime or composite?
OK. Now you know that 4020 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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