VERY Basic Primefinding For Class

#include <stdio.h>

    int main()
    {
        int x,isprime=1;
        scanf("%d",&x);

        if(x==1 || x==2){printf("Prime Number %d",x);}
        else if(x>2)
        {
            int div;
            for(div=3;div<x;div=div+2)
            {
                if (x%div!=0)
                    {isprime=1;}

                else {
                isprime=0;
                printf("Not Prime %d",x);
                break;
                }

            }
        }
        if(isprime==1 && x!=1 && x!=2){printf("%d is PRIME",x);}

        return 0;

    }