A Magic Square is -multimagic if the square formed by replacing each element by its th power for , 2, ..., is also magic. A 2-multimagic square is called a Bimagic Square, and a 3-multimagic square is called a Trimagic Square.
See also Bimagic Square, Magic Square, Trimagic Square
References
Kraitchik, M. ``Multimagic Squares.'' §7.10 in Mathematical Recreations. New York: W. W. Norton, pp. 176-178, 1942.