Crossword Genius

Main sort of number (5)

Ross

I believe the answer is:

prime

I believe this clue is a double definition.

'main' is the first definition.
(thesaurus)

'sort of number' is the second definition.
(I know that prime is a type of number)

(Other definitions for prime that I've seen before include "Chief or most important, like a minister" , "Number with no factor but itself and 1" , "Main; make usable" , "At least two" , "Prepare to fire - first" .)

I've seen this clue in The Mirror.
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