Did you know that all numbers (integers) that surround you are decomposable into a product of prime factors and that this decomposition is unique to the order of the factors closely?
This is one of the most famous theorem of arithmetic and its use is positively desirable or even essential when dealing with fractions, for example.
Back on this little gem of arithmetic (for starters) three videos showing you how to decompose an integer less than 100 in a product of prime factors:
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