To determine if 561 is a prime number or a composite number, we simply look at the factors for 561.
If the factors of 561 are only 561 and 1, then we know that 561 is a prime number. Otherwise, 561 is a composite number.
To explain better, if 561 is only divisible by 1 and 561, then it is a prime number, and if 561 is divisible by more than 561 and 1, then it is a composite number.
The factors of 561 are as follows:
1, 3, 11, 17, 33, 51, 187, 561
Therefore, since 561 is divisible by more than one and itself, the answer to the
question "Is 561 prime or composite?" is highlighted in blue below.
composite
Is 562 prime or composite?
OK. Now you know that 561 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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