245 is not prime.
Composite: (5 x 49 or 5 x 7 x 7)
Also you can automatically determine a number as composite if:
it ends with 2, 4, 6, 8, and 0: multiples of 2; or
it ends with 5: multiples of 5.
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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
It is a composite number.