To determine if 815 is a prime number or a composite number, we simply look at the factors for 815.
If the factors of 815 are only 815 and 1, then we know that 815 is a prime number. Otherwise, 815 is a composite number.
To explain better, if 815 is only divisible by 1 and 815, then it is a prime number, and if 815 is divisible by more than 815 and 1, then it is a composite number.
The factors of 815 are as follows:
1, 5, 163, 815
Therefore, since 815 is divisible by more than one and itself, the answer to the
question "Is 815 prime or composite?" is highlighted in blue below.
composite
Is 816 prime or composite?
OK. Now you know that 815 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.
|
|
