Answer:
689 is not a Prime number. It is a composite number.
Definition:
A prime number has exactly two factors: 1 (also known as unity) and itself. A composite number has more than two factors; in other words, it has at least one factor besides 1 and itself.
Explanation:
689 is also divisible by 13 and 53, so it is a composite number.
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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.