To determine if 7215 is a prime number or a composite number, we simply look at the factors for 7215.
If the factors of 7215 are only 7215 and 1, then we know that 7215 is a prime number. Otherwise, 7215 is a composite number.
To explain better, if 7215 is only divisible by 1 and 7215, then it is a prime number, and if 7215 is divisible by more than 7215 and 1, then it is a composite number.
The factors of 7215 are as follows:
1, 3, 5, 13, 15, 37, 39, 65, 111, 185, 195, 481, 555, 1443, 2405, 7215
Therefore, since 7215 is divisible by more than one and itself, the answer to the
question "Is 7215 prime or composite?" is highlighted in blue below.
composite
Is 7216 prime or composite?
OK. Now you know that 7215 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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