It is composite, and the first give-away is that it is an even number (divisible by 2).
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158 is composite.
158 is a composite number because it has factors other than 1 and itself. It is not a prime number. The 4 factors of 158 are 1, 2, 79, and 158. The prime factors of 158 are 2 and 79. The prime factorization of 158 is 2 x 79. NOTE: There cannot be common factors, a greatest common factor, or a least common multiple because "common" refers to factors or multiples that two or more numbers have in common.
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