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'5' os a Prime number.
This means it can only be divided by '1' & '5' itself.
So the 'factors' of '5' are , '1' & '5'
The factors of 55 are 1, 5, 11, and 55. Prime factors of 55 are 5 and 11.
Multiply prime squares by themselves. 24, 34, 54 all have five factors.
A factor is a number easily divisible by another number. The factors of twenty five are one, five, and twenty five.
There are three of them with exactly five factors.
Numbers which are the factors of thirty and multiples of five are 5, 10, 15 and 30.