To determine if 1239 is a prime number or a composite number, we simply look at the factors for 1239.
If the factors of 1239 are only 1239 and 1, then we know that 1239 is a prime number. Otherwise, 1239 is a composite number.
To explain better, if 1239 is only divisible by 1 and 1239, then it is a prime number, and if 1239 is divisible by more than 1239 and 1, then it is a composite number.
The factors of 1239 are as follows:
1, 3, 7, 21, 59, 177, 413, 1239
Therefore, since 1239 is divisible by more than one and itself, the answer to the
question "Is 1239 prime or composite?" is highlighted in blue below.
composite
Is 1240 prime or composite?
OK. Now you know that 1239 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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