As an even number greater than 2, 600 is a composite number. Its positive integer factors are:
1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 25, 30, 40, 50, 60, 75, 100, 120, 150, 200, 300, 600
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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
Prime.