#include<stdio.h> #include<conio.h> void main() { int n, i, count=0; clrscr(); printf("\nEnter a number: "); scanf("%d",&n); for(i=2;i<=n/2;i++) { if(n%i==0) { count++; break; } } if(count==0) { printf("%d is a prime number",n); } else { printf("%d is not a prime number",n); } getch(); } OUTPUT: Enter a number: 11 11 is a prime number Enter a number: 25 25 is not a prime number
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