To determine if 615 is a prime number or a composite number, we simply look at the factors for 615.
If the factors of 615 are only 615 and 1, then we know that 615 is a prime number. Otherwise, 615 is a composite number.
To explain better, if 615 is only divisible by 1 and 615, then it is a prime number, and if 615 is divisible by more than 615 and 1, then it is a composite number.
The factors of 615 are as follows:
1, 3, 5, 15, 41, 123, 205, 615
Therefore, since 615 is divisible by more than one and itself, the answer to the
question "Is 615 prime or composite?" is highlighted in blue below.
composite
Is 616 prime or composite?
OK. Now you know that 615 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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