To determine if 810 is a prime number or a composite number, we simply look at the factors for 810.
If the factors of 810 are only 810 and 1, then we know that 810 is a prime number. Otherwise, 810 is a composite number.
To explain better, if 810 is only divisible by 1 and 810, then it is a prime number, and if 810 is divisible by more than 810 and 1, then it is a composite number.
The factors of 810 are as follows:
1, 2, 3, 5, 6, 9, 10, 15, 18, 27, 30, 45, 54, 81, 90, 135, 162, 270, 405, 810
Therefore, since 810 is divisible by more than one and itself, the answer to the
question "Is 810 prime or composite?" is highlighted in blue below.
composite
Is 811 prime or composite?
OK. Now you know that 810 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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