To determine if 1290 is a prime number or a composite number, we simply look at the factors for 1290.
If the factors of 1290 are only 1290 and 1, then we know that 1290 is a prime number. Otherwise, 1290 is a composite number.
To explain better, if 1290 is only divisible by 1 and 1290, then it is a prime number, and if 1290 is divisible by more than 1290 and 1, then it is a composite number.
The factors of 1290 are as follows:
1, 2, 3, 5, 6, 10, 15, 30, 43, 86, 129, 215, 258, 430, 645, 1290
Therefore, since 1290 is divisible by more than one and itself, the answer to the
question "Is 1290 prime or composite?" is highlighted in blue below.
composite
Is 1291 prime or composite?
OK. Now you know that 1290 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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