To determine if 820 is a prime number or a composite number, we simply look at the factors for 820.
If the factors of 820 are only 820 and 1, then we know that 820 is a prime number. Otherwise, 820 is a composite number.
To explain better, if 820 is only divisible by 1 and 820, then it is a prime number, and if 820 is divisible by more than 820 and 1, then it is a composite number.
The factors of 820 are as follows:
1, 2, 4, 5, 10, 20, 41, 82, 164, 205, 410, 820
Therefore, since 820 is divisible by more than one and itself, the answer to the
question "Is 820 prime or composite?" is highlighted in blue below.
composite
Is 821 prime or composite?
OK. Now you know that 820 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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