A prime number is a number that is only evenly divisble by itself and $1.$

For example, the number $5$ is prime because it can only be evenlly divided by $1$

and $5.$ The number $6,$ however, is not prime because it can be divided evenly

by $2$ and $3.$

Write a Boolean function named is$\_$prime which takes an integer as an argument

and returns true if the argument is a prime number, or false otherwise. Use

the function in a program that prompts the user to enter a number and then

prints whether the number is prime.