To determine if 1845 is a prime number or a composite number, we simply look at the factors for 1845.
If the factors of 1845 are only 1845 and 1, then we know that 1845 is a prime number. Otherwise, 1845 is a composite number.
To explain better, if 1845 is only divisible by 1 and 1845, then it is a prime number, and if 1845 is divisible by more than 1845 and 1, then it is a composite number.
The factors of 1845 are as follows:
1, 3, 5, 9, 15, 41, 45, 123, 205, 369, 615, 1845
Therefore, since 1845 is divisible by more than one and itself, the answer to the
question "Is 1845 prime or composite?" is highlighted in blue below.
composite
Is 1846 prime or composite?
OK. Now you know that 1845 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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