To determine if 858 is a prime number or a composite number, we simply look at the factors for 858.
If the factors of 858 are only 858 and 1, then we know that 858 is a prime number. Otherwise, 858 is a composite number.
To explain better, if 858 is only divisible by 1 and 858, then it is a prime number, and if 858 is divisible by more than 858 and 1, then it is a composite number.
The factors of 858 are as follows:
1, 2, 3, 6, 11, 13, 22, 26, 33, 39, 66, 78, 143, 286, 429, 858
Therefore, since 858 is divisible by more than one and itself, the answer to the
question "Is 858 prime or composite?" is highlighted in blue below.
composite
Is 859 prime or composite?
OK. Now you know that 858 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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