numberp object → generalized-boolean

object — an object.

generalized-boolean — a generalized boolean.

Returns true if object is of type number; otherwise, returns false.

(numberp 12) → true 
(numberp (expt 2 130)) → true 
(numberp #c(5/3 7.2)) → true 
(numberp nil) → false 
(numberp (cons 1 2)) → false

(numberp object) ≡ (typep object 'number)