To determine if 4005 is a prime number or a composite number, we simply look at the factors for 4005.
If the factors of 4005 are only 4005 and 1, then we know that 4005 is a prime number. Otherwise, 4005 is a composite number.
To explain better, if 4005 is only divisible by 1 and 4005, then it is a prime number, and if 4005 is divisible by more than 4005 and 1, then it is a composite number.
The factors of 4005 are as follows:
1, 3, 5, 9, 15, 45, 89, 267, 445, 801, 1335, 4005
Therefore, since 4005 is divisible by more than one and itself, the answer to the
question "Is 4005 prime or composite?" is highlighted in blue below.
composite
Is 4006 prime or composite?
OK. Now you know that 4005 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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