You can check if a number is prime by going to the URL http://isthisprime.com/nnnnn.. http://isthisprime.com/nnnnn... where nnnn is a number (like http://isth

You can check if a number is prime by going to the URL http://isthisprime.com/nnnnn.. http://isthisprime.com/nnnnn... where nnnn is a number (like http://isthisprime.com/5867868 http://isthisprime.com/5867868) (note it does take some time with BIG numbers)