1155 is a composite number because it ends with 5. All numbers that end with 5 except 5 itself are composite numbers because they are divisible by 5, which means there are at least three factors, 1, 5, and the number itself.
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1155 is a composite number because it has more than two factors
1155 = 3 * 5 * 7 * 11 So, no, since it has factors other than one and itself, it's composite.
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