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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.