Input
Output
#include <stdio.h> void main() { int n=6, i, flag = 0; printf("Enter the number: "); printf("%d\n", n); for(i = 2; i <= n/2; i++) { if(n%i == 0) { flag = 1; break; } } if ( n<=1) { printf("Prime number is greater than 1."); } else { if (flag == 0) printf("%d is a prime number.", n); else printf("%d is not a prime number.", n); } }