525 is divisible by 5 (in addition to 1 and itself). It is a composite number.
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525 is a composite 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 have a different name.
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
composite
Prime.