# Where to find a summary for Q functions? [duplicate]

Is there a summary for all Function like
NumberQ, LetterQ and so forth?

data=123;
IntegerQ[data]

True

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## marked as duplicate by rm -rf♦Mar 7 at 14:58

?*Q

(+1) or ?**Q to get all 1243 functions. – kguler Mar 7 at 13:55
Of course, not all of these are querying functions. EllipticNomeQ[], LegendreQ[], and MarcumQ[]` are examples that spring to mind. – J. M. Apr 16 at 13:24