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#elisp
Function: numberp object

This predicate tests whether its argument is a number (either integer or floating point), and returns t if so, nil otherwise.

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GNU Emacs Lisp Reference Manual: Predicates on Numbers
p object This predicate tests whether its argument is floating point and returns t if so, nil otherwise. Function: integerp object This predicate tests whether its argument is an integer, and returns t if so, nil otherwise. <span>Function: numberp object This predicate tests whether its argument is a number (either integer or floating point), and returns t if so, nil otherwise. Function: natnump object This predicate (whose name comes from the phrase “natural number”) tests to see whether its argument is a nonnegative integer, and returns t if so, nil o

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