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most numbers are product of multiplications of more than two numbers
look at theis numbers
4 is a product of multiplications of 2 * 2
6 is a product of multiplications of 3 * 2
8 is a product of multiplications of 4 * 2
9 is a product of multiplications of 3 * 3
10 is a product of multiplications of 5 * 2
while there are numbers do not , it called prime numbers
theis numbers are somehow few, look at these numbers
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,... you cant find 2 numbers when multiplied together result the prime number
except 1 and the number it self
on the other hand, the other numbers can be result in several number multiplications
look at these:
4 is multiplications of 2 * 2
12 have several numbers
6 * 2
3 * 4
as you notice, these can be product of simpler one
12 = 2 * 2 * 3