Want to see if any number between 1 and 10,000,000,000 is a prime number?
Type your candidate number in the box below. Don't use any commas
or spaces. Now press enter or press the tab key--whichever your computer allows.
Be sure to clear the box completely using backspace before entering
a new number. Remember, large prime numbers take a long time. It ain't
over until the alert dialog box shows. Be patient!