To determine if 857 is a prime number or a composite number, we simply look at the factors for 857.
If the factors of 857 are only 857 and 1, then we know that 857 is a prime number. Otherwise, 857 is a composite number.
To explain better, if 857 is only divisible by 1 and 857, then it is a prime number, and if 857 is divisible by more than 857 and 1, then it is a composite number.
The factors of 857 are as follows:
1, 857
Therefore, since 857 is divisible by only one and itself, the answer to the
question "Is 857 prime or composite?" is highlighted in blue below.
prime
Is 858 prime or composite?
OK. Now you know that 857 is a prime 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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