To determine if 1251 is a prime number or a composite number, we simply look at the factors for 1251.
If the factors of 1251 are only 1251 and 1, then we know that 1251 is a prime number. Otherwise, 1251 is a composite number.
To explain better, if 1251 is only divisible by 1 and 1251, then it is a prime number, and if 1251 is divisible by more than 1251 and 1, then it is a composite number.
The factors of 1251 are as follows:
1, 3, 9, 139, 417, 1251
Therefore, since 1251 is divisible by more than one and itself, the answer to the
question "Is 1251 prime or composite?" is highlighted in blue below.
composite
Is 1252 prime or composite?
OK. Now you know that 1251 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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