To determine if 1781 is a prime number or a composite number, we simply look at the factors for 1781.
If the factors of 1781 are only 1781 and 1, then we know that 1781 is a prime number. Otherwise, 1781 is a composite number.
To explain better, if 1781 is only divisible by 1 and 1781, then it is a prime number, and if 1781 is divisible by more than 1781 and 1, then it is a composite number.
The factors of 1781 are as follows:
1, 13, 137, 1781
Therefore, since 1781 is divisible by more than one and itself, the answer to the
question "Is 1781 prime or composite?" is highlighted in blue below.
composite
Is 1782 prime or composite?
OK. Now you know that 1781 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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