To determine if 855 is a prime number or a composite number, we simply look at the factors for 855.
If the factors of 855 are only 855 and 1, then we know that 855 is a prime number. Otherwise, 855 is a composite number.
To explain better, if 855 is only divisible by 1 and 855, then it is a prime number, and if 855 is divisible by more than 855 and 1, then it is a composite number.
The factors of 855 are as follows:
1, 3, 5, 9, 15, 19, 45, 57, 95, 171, 285, 855
Therefore, since 855 is divisible by more than one and itself, the answer to the
question "Is 855 prime or composite?" is highlighted in blue below.
composite
Is 856 prime or composite?
OK. Now you know that 855 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.
|
|
