To determine if 819 is a prime number or a composite number, we simply look at the factors for 819.
If the factors of 819 are only 819 and 1, then we know that 819 is a prime number. Otherwise, 819 is a composite number.
To explain better, if 819 is only divisible by 1 and 819, then it is a prime number, and if 819 is divisible by more than 819 and 1, then it is a composite number.
The factors of 819 are as follows:
1, 3, 7, 9, 13, 21, 39, 63, 91, 117, 273, 819
Therefore, since 819 is divisible by more than one and itself, the answer to the
question "Is 819 prime or composite?" is highlighted in blue below.
composite
Is 820 prime or composite?
OK. Now you know that 819 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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