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NumericQ

Like NumberQ but also recognizes numeric constants such as Pi.

$ wo 'NumericQ[Pi]'
True

$ wo 'NumericQ["abc"]'
False

A constant is numeric wherever it sits in a product:

$ wo 'NumericQ[Pi 2]'
True

$ wo 'NumericQ[Pi I]'
True

A symbol with no numeric value is not, and neither is Infinity:

$ wo 'NumericQ[Pi x]'
False

$ wo 'NumericQ[Infinity]'
False