To determine if 1615 is a prime number or a composite number, we simply look at the factors for 1615.
If the factors of 1615 are only 1615 and 1, then we know that 1615 is a prime number. Otherwise, 1615 is a composite number.
To explain better, if 1615 is only divisible by 1 and 1615, then it is a prime number, and if 1615 is divisible by more than 1615 and 1, then it is a composite number.
The factors of 1615 are as follows:
1, 5, 17, 19, 85, 95, 323, 1615
Therefore, since 1615 is divisible by more than one and itself, the answer to the
question "Is 1615 prime or composite?" is highlighted in blue below.
composite
Is 1616 prime or composite?
OK. Now you know that 1615 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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