56
2,2,2,7
perfect cubes=1,8
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For a number to be a perfect square and a perfect cube, it must be a perfect sixth power. Now 36 = 729 is too small and 56 = 15625 is too large, leaving 46 = 4096 as the answer.
The cube root of -56 = -3.825862
If by cube you mean perfect cube (a cube of an integer), then no, and the nearest perfect cube is 81.
It is a perfect cube.
It is not a perfect cube.