Is 89 a prime number?

yes

Recall that a prime number is a whole number greater than 1 that can only be divided by 1 and itself, without producing a decimal number.

You can try dividing 89 by any number other than 1 or 89, and you will find that a decimal number is always produced.

For this reason, since 89 can only be divided by 1 and 89, it is a prime number .