To determine if 285 is a prime number or a composite number, we simply look at the factors for 285.
If the factors of 285 are only 285 and 1, then we know that 285 is a prime number. Otherwise, 285 is a composite number.
To explain better, if 285 is only divisible by 1 and 285, then it is a prime number, and if 285 is divisible by more than 285 and 1, then it is a composite number.
The factors of 285 are as follows:
1, 3, 5, 15, 19, 57, 95, 285
Therefore, since 285 is divisible by more than one and itself, the answer to the
question "Is 285 prime or composite?" is highlighted in blue below.
composite
Is 286 prime or composite?
OK. Now you know that 285 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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