To determine if 1555 is a prime number or a composite number, we simply look at the factors for 1555.
If the factors of 1555 are only 1555 and 1, then we know that 1555 is a prime number. Otherwise, 1555 is a composite number.
To explain better, if 1555 is only divisible by 1 and 1555, then it is a prime number, and if 1555 is divisible by more than 1555 and 1, then it is a composite number.
The factors of 1555 are as follows:
1, 5, 311, 1555
Therefore, since 1555 is divisible by more than one and itself, the answer to the
question "Is 1555 prime or composite?" is highlighted in blue below.
composite
Is 1556 prime or composite?
OK. Now you know that 1555 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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