#include<stdio.h>
#include<conio.h>
int main()
{
int N, d;
printf("\nNhap N: ");
scanf("%d", &N);
if(N < 2)
printf("\nSo %d khong la so nguyen to", N);
else
if(N == 2)
printf("\nSo %d la so nguyen to", N);
else
if(N % 2 == 0)
printf("\nSo %d khong la so nguyen to", N);
else
{
d = 3;
while(d <= N)
{
if(N % d == 0)
break;
d = d + 2;
}
if(d == N)
printf("\nSo %d la so nguyen to", N);
else
printf("\nSo %d khong la so nguyen to", N);
}
getch();
return 0;
}