To determine if 555 is a prime number or a composite number, we simply look at the factors for 555.
If the factors of 555 are only 555 and 1, then we know that 555 is a prime number. Otherwise, 555 is a composite number.
To explain better, if 555 is only divisible by 1 and 555, then it is a prime number, and if 555 is divisible by more than 555 and 1, then it is a composite number.
The factors of 555 are as follows:
1, 3, 5, 15, 37, 111, 185, 555
Therefore, since 555 is divisible by more than one and itself, the answer to the
question "Is 555 prime or composite?" is highlighted in blue below.
composite
Is 556 prime or composite?
OK. Now you know that 555 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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