729 squared is 531,441.
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It is: 27
The cubed root of 726 is 9. 9 squared is 81
7292 = 531441 square cm
Any number to the 6th power will be both a squared number and a cubed number. The first 10 such numbers are: 1 64 729 4096 15625 46656 117649 262144 531441 1000000
36 = 729