prime

set -vx
echo "enter no"
read no

flag=0

n=` expr $no - 1 `

while [ $n -ne 1 ]
do
  
 res=` expr $no % $n`
 
   if [ $res -eq 0 ]
then  
        flag=1
     break
   fi

  n=` expr $n -1 `

done

if [ $flag -ne 1 ]
then
  echo "prime"
else
echo "not prime"
fi