To determine if 8405 is a prime number or a composite number, we simply look at the factors for 8405.
If the factors of 8405 are only 8405 and 1, then we know that 8405 is a prime number. Otherwise, 8405 is a composite number.
To explain better, if 8405 is only divisible by 1 and 8405, then it is a prime number, and if 8405 is divisible by more than 8405 and 1, then it is a composite number.
The factors of 8405 are as follows:
1, 5, 41, 205, 1681, 8405
Therefore, since 8405 is divisible by more than one and itself, the answer to the
question "Is 8405 prime or composite?" is highlighted in blue below.
composite
Is 8406 prime or composite?
OK. Now you know that 8405 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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