Composite.
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No, 273 is not a prime number. It is a composite number. A prime number can only be divided by 1 and itself. 273 can also be divided by 3, 7, 13, 21, 39, and 91.
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
Prime.