By definition, "unique" indicates there is only one.
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Every positive composite number only has one unique prime factorization.
Every prime number has exactly 2 factors, 1 and the number itself.
There are factor trees, fireworks, rainbows, etc., but those are just differences in notation. The unique prime factorization of 260 is 2 x 2 x 5 x 13.
Only one - which is repeated.
Two distinct prime factors, six total prime factors.