To determine if 1720 is a prime number or a composite number, we simply look at the factors for 1720.
If the factors of 1720 are only 1720 and 1, then we know that 1720 is a prime number. Otherwise, 1720 is a composite number.
To explain better, if 1720 is only divisible by 1 and 1720, then it is a prime number, and if 1720 is divisible by more than 1720 and 1, then it is a composite number.
The factors of 1720 are as follows:
1, 2, 4, 5, 8, 10, 20, 40, 43, 86, 172, 215, 344, 430, 860, 1720
Therefore, since 1720 is divisible by more than one and itself, the answer to the
question "Is 1720 prime or composite?" is highlighted in blue below.
composite
Is 1721 prime or composite?
OK. Now you know that 1720 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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