To determine if 813 is a prime number or a composite number, we simply look at the factors for 813.
If the factors of 813 are only 813 and 1, then we know that 813 is a prime number. Otherwise, 813 is a composite number.
To explain better, if 813 is only divisible by 1 and 813, then it is a prime number, and if 813 is divisible by more than 813 and 1, then it is a composite number.
The factors of 813 are as follows:
1, 3, 271, 813
Therefore, since 813 is divisible by more than one and itself, the answer to the
question "Is 813 prime or composite?" is highlighted in blue below.
composite
Is 814 prime or composite?
OK. Now you know that 813 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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