Crossword Genius

Excellent number with no factors (5)

Ross

I believe the answer is:

prime

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'excellent' is the definition.
(thesaurus)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for prime that I've seen before include "Prepare to set off" , "Maybe eleven" , "Foremost" , "Best - get ready" , "Best quality, perhaps of beef" .)

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