Is 87 a prime number?

Answer 1

#87# is not a prime number but is a composite number.

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

Here a number less than approximately the square root of #87# is #9#, so one needs to try division of #87# by prime numbers up to number #9#.

As prime numbers up to #9# are only #{2,3,5,7}# and number is divisible by #3# (one can check by using divisibility rule),

#87# is not a prime number but is a composite number.

In fact #87=3xx29#

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Answer 2

Jeremiah Andrews

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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Answer from HIX Tutor

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.