# Is 87 a prime number?

To check whether a number is a prime number or not, one may take a number less than approximately its square root.

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No, 87 is not a prime number. It is divisible by numbers other than 1 and itself. Specifically, 87 can be divided evenly by 3 and 29. Therefore, it is not a prime number.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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