I downloaded this program even though I already had the “Omnicalc” app with its "factor(" function, and this program really is fast. I tested it with several numbers against other prime checker programs; it took 1.07 seconds to factor 6947 and determine that it was prime, whereas “Omnicalc,” the second-fastest out of all the ones I tested, took 1.28 seconds, and so on. And while that .2 seconds doesn't really matter, it just means that this program is great for anyone who needs to quickly factor any number with a compact program.