72 is NOT a prime number: 72 = 2 * 2 * 2 * 3 * 3
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document.write( "72 is divisible by 2: 72 = 36 * 2.\n" );
document.write( "36 is divisible by 2: 36 = 18 * 2.\n" );
document.write( "18 is divisible by 2: 18 = 9 * 2.\n" );
document.write( "9 is divisible by 3: 9 = 3 * 3.\n" );
document.write( "3 is not divisible by anything.\n" );
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document.write( " This calculation used this Prime Factorization Algorithm.
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