store/[org.clojure/clojure "1.8.0"] clj::clojure.core/number?

Official Documentation

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Arities
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Docstring
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  Returns true if x is a Number

Source

(defn number?
  "Returns true if x is a Number"
  {:added "1.0"
   :static true}
  [x]
  (instance? Number x))

Example 1

Edit
(number? 1)
;; => true

(number? 1.0)
;; => true

(number? :a)
;; => false

(number? nil)
;; => false

(number? "23")
;; => false

Uses on crossclj