It is the forth Prime number. Whenever you wanted to know a number is prime or composite, use this site. It must be usefull: prime-calculator dot com. It has lots of other abilities. Enjoy it.
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57 is a prime number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
It is composite.
It is prime
86 is not a prime number, so is a composite.
No 168 is not a prime number it is a composite number