To determine if 620 is a prime number or a composite number, we simply look at the factors for 620.
If the factors of 620 are only 620 and 1, then we know that 620 is a prime number. Otherwise, 620 is a composite number.
To explain better, if 620 is only divisible by 1 and 620, then it is a prime number, and if 620 is divisible by more than 620 and 1, then it is a composite number.
The factors of 620 are as follows:
1, 2, 4, 5, 10, 20, 31, 62, 124, 155, 310, 620
Therefore, since 620 is divisible by more than one and itself, the answer to the
question "Is 620 prime or composite?" is highlighted in blue below.
composite
Is 621 prime or composite?
OK. Now you know that 620 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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