DocumentationMathematicaThe Mathematica BookMathematica Reference GuideDeveloper Context Objects in Mathematica 5
MachineIntegerQ[expr] returns True if expr corresponds to a machine-sized integer, and False otherwise.
On a typical computer system machine-sized integers must lie in the range to or to .
Results from Mathematica are not affected by whether an integer is machine-sized or not; the speed of operations may however be affected.
See also: $MaxMachineInteger, Precision.