Crossword Genius

Prime number factor (3)

Ross

I believe the answer is:

one

'prime number factor' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for one that I've seen before include "Single, unitary" , "Identical; number" , "This is singular" , "Single and undivided" , "Ace" .)

I've seen this clue in The Wall Street Journal.
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