"Distinct," in this case, means "don't repeat any." The prime factorization of 36 is 2 x 2 x 3 x 3. The distinct prime factors of 36 are 2 and 3.
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Prime numbers have one distinct prime factor.
It is a square of that factor. E.g. 5 is a distinct factor of 25. If you multiply that distinct factor by itself (5*5) you get 25. A square comes from the x^2 notation and is any number which has a factor which is multiplied by itself.
The math factor pairs of 18 are (1,18) , (2,9) , (3,6) .
"Divisor" is a synonym of "factor."
21,17,3