To determine if 1561 is a prime number or a composite number, we simply look at the factors for 1561.
If the factors of 1561 are only 1561 and 1, then we know that 1561 is a prime number. Otherwise, 1561 is a composite number.
To explain better, if 1561 is only divisible by 1 and 1561, then it is a prime number, and if 1561 is divisible by more than 1561 and 1, then it is a composite number.
The factors of 1561 are as follows:
1, 7, 223, 1561
Therefore, since 1561 is divisible by more than one and itself, the answer to the
question "Is 1561 prime or composite?" is highlighted in blue below.
composite
Is 1562 prime or composite?
OK. Now you know that 1561 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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