To determine if 1285 is a prime number or a composite number, we simply look at the factors for 1285.
If the factors of 1285 are only 1285 and 1, then we know that 1285 is a prime number. Otherwise, 1285 is a composite number.
To explain better, if 1285 is only divisible by 1 and 1285, then it is a prime number, and if 1285 is divisible by more than 1285 and 1, then it is a composite number.
The factors of 1285 are as follows:
1, 5, 257, 1285
Therefore, since 1285 is divisible by more than one and itself, the answer to the
question "Is 1285 prime or composite?" is highlighted in blue below.
composite
Is 1286 prime or composite?
OK. Now you know that 1285 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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