9, 81, 6561, 43046721, ...
This would be the sequence 9^(2^(n-1))
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square of 6561 is 43046721 square root is 81
There should only be four numbers in the question: 3, 9, 81 and 6561. Then the fifth is 43046721.
812= 6561812= 6561812= 6561812= 6561
65613 = 6561 x 6561 x 6561 = 282429536481
The square root of 6561 is 81