To determine if 1245 is a prime number or a composite number, we simply look at the factors for 1245.
If the factors of 1245 are only 1245 and 1, then we know that 1245 is a prime number. Otherwise, 1245 is a composite number.
To explain better, if 1245 is only divisible by 1 and 1245, then it is a prime number, and if 1245 is divisible by more than 1245 and 1, then it is a composite number.
The factors of 1245 are as follows:
1, 3, 5, 15, 83, 249, 415, 1245
Therefore, since 1245 is divisible by more than one and itself, the answer to the
question "Is 1245 prime or composite?" is highlighted in blue below.
composite
Is 1246 prime or composite?
OK. Now you know that 1245 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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