http://demonstrations.wolfram.com/WhyANumberIsPrime/
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
Move the n slider to see that if n is a prime number, n squares cannot be arranged into a rectangular array unless the width or length is 1. That is, it is not possible to represent a prime as the product of two integers a◊b with a, bgt1.
Contributed by: Enrique Zeleny
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