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FilledSmallSquareIntegerQ[expr] gives True if expr is an integer, and False otherwise.

FilledSmallSquareIntegerQ[expr] returns False unless expr is manifestly an integer (i.e., has head Integer).

FilledSmallSquareSimplify[expr Integers] can be used to try to determine whether an expression is mathematically equal to an integer.

FilledSmallSquare See The Mathematica Book: Section 2.3.5 and Section 3.1.1.

FilledSmallSquare See also: EvenQ, OddQ, NumberQ, TrueQ, Element.

Further Examples