gives True if expr is a numeric quantity, and False otherwise.
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.
In most cases, NumericQ[expr] gives True whenever N[expr] would yield an explicit number.
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NumericQ tests whether an object is a numeric quantity:
In most cases, NumericQ[expr] gives True whenever N[expr] yields an explicit number:
An object is numeric if all its constituents are numeric:
Some parts of the expression are numeric:
When f has the NumericFunction attribute then f[args] is numeric when args are numeric:
The system symbols that represent numerical constants: