MachineNumberQ

MachineNumberQ[expr] returns True if expr is a machine-precision real or complex number, and returns False otherwise.

Examples

Test a machine-precision number:

MachineNumberQ[1.5]
(* True *)

Test an exact number:

MachineNumberQ[3/2]
(* False *)

Test a high-precision number:

MachineNumberQ[N[Pi, 50]]
(* False *)

Please visit the official Wolfram Language Reference for more details.