To determine if 3999 is a prime number or a composite number, we simply look at the factors for 3999.
If the factors of 3999 are only 3999 and 1, then we know that 3999 is a prime number. Otherwise, 3999 is a composite number.
To explain better, if 3999 is only divisible by 1 and 3999, then it is a prime number, and if 3999 is divisible by more than 3999 and 1, then it is a composite number.
The factors of 3999 are as follows:
1, 3, 31, 43, 93, 129, 1333, 3999
Therefore, since 3999 is divisible by more than one and itself, the answer to the
question "Is 3999 prime or composite?" is highlighted in blue below.
composite
Is 4000 prime or composite?
OK. Now you know that 3999 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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