To determine if 7820 is a prime number or a composite number, we simply look at the factors for 7820.
If the factors of 7820 are only 7820 and 1, then we know that 7820 is a prime number. Otherwise, 7820 is a composite number.
To explain better, if 7820 is only divisible by 1 and 7820, then it is a prime number, and if 7820 is divisible by more than 7820 and 1, then it is a composite number.
The factors of 7820 are as follows:
1, 2, 4, 5, 10, 17, 20, 23, 34, 46, 68, 85, 92, 115, 170, 230, 340, 391, 460, 782, 1564, 1955, 3910, 7820
Therefore, since 7820 is divisible by more than one and itself, the answer to the
question "Is 7820 prime or composite?" is highlighted in blue below.
composite
Is 7821 prime or composite?
OK. Now you know that 7820 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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