Write a Program Number is Prime OR Not

flag=0

for ((index=2 ; index <= $1/2 ; index++))
do
    if [ `expr $1 % $index` -eq 0 ]
    then
        flag=1
        break
    fi
done

if [ $flag -eq 0 ]
then
    echo "Prime"
else
    echo "Not Prime"
fi



OUTPUT:-

#!/bin/bash
#[root@localhost scripts]# ./prime 7
#Prime