find square root by factorisation 6561
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6561 = 3x3x3x3x3x3x3x3
= 3*2 x 3*2 x 3*2 x 3*2
the square root of 6561 is 81
= 3*2 x 3*2 x 3*2 x 3*2
the square root of 6561 is 81
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