Answer :

#include<stdio.h>

int main ()

{

int num1,factor=0,i;

printf("Enter the number you like   ");

scanf("%d",&num1);

for (i=1;i<=num1;i++)

{

if(num1%i==0)

{

factor++;

}

}

if (factor==2)

{

printf("%d is a prime number",num1);

}

else

{

printf("%d is not a prime number",num1);

}

}

Output :