I need help

Question

Read number from keyboard and print if it prime or not prime

Answer 1

0)if 2 then true else
1)run a loop from 2 to that number/2 ... b
2)if n%b==0; then print "false" & break; through loop
3) else "true" .

//well , different starategies are possible
//I have made 1-liner recursion funcn also for that