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N (modified)NumericFunction

NumericQ

FilledSmallSquareNumericQ[expr] gives True if expr is a numeric quantity, and False otherwise.

FilledSmallSquare An expression is considered a numeric quantity if it is either an explicit number or a mathematical constant such as Pi, or is a function that has attribute NumericFunction and all of whose arguments are numeric quantities.

FilledSmallSquare In most cases, NumericQ[expr] gives True whenever N[expr] would yield an explicit number.

FilledSmallSquare See The Mathematica Book: Section 2.3.5 and Section 3.1.2.

FilledSmallSquare See also: NumberQ.

Further Examples

N (modified)NumericFunction