To determine if 1785 is a prime number or a composite number, we simply look at the factors for 1785.
If the factors of 1785 are only 1785 and 1, then we know that 1785 is a prime number. Otherwise, 1785 is a composite number.
To explain better, if 1785 is only divisible by 1 and 1785, then it is a prime number, and if 1785 is divisible by more than 1785 and 1, then it is a composite number.
The factors of 1785 are as follows:
1, 3, 5, 7, 15, 17, 21, 35, 51, 85, 105, 119, 255, 357, 595, 1785
Therefore, since 1785 is divisible by more than one and itself, the answer to the
question "Is 1785 prime or composite?" is highlighted in blue below.
composite
Is 1786 prime or composite?
OK. Now you know that 1785 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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