To determine if 1805 is a prime number or a composite number, we simply look at the factors for 1805.
If the factors of 1805 are only 1805 and 1, then we know that 1805 is a prime number. Otherwise, 1805 is a composite number.
To explain better, if 1805 is only divisible by 1 and 1805, then it is a prime number, and if 1805 is divisible by more than 1805 and 1, then it is a composite number.
The factors of 1805 are as follows:
1, 5, 19, 95, 361, 1805
Therefore, since 1805 is divisible by more than one and itself, the answer to the
question "Is 1805 prime or composite?" is highlighted in blue below.
composite
Is 1806 prime or composite?
OK. Now you know that 1805 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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