To determine if 1780 is a prime number or a composite number, we simply look at the factors for 1780.
If the factors of 1780 are only 1780 and 1, then we know that 1780 is a prime number. Otherwise, 1780 is a composite number.
To explain better, if 1780 is only divisible by 1 and 1780, then it is a prime number, and if 1780 is divisible by more than 1780 and 1, then it is a composite number.
The factors of 1780 are as follows:
1, 2, 4, 5, 10, 20, 89, 178, 356, 445, 890, 1780
Therefore, since 1780 is divisible by more than one and itself, the answer to the
question "Is 1780 prime or composite?" is highlighted in blue below.
composite
Is 1781 prime or composite?
OK. Now you know that 1780 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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