Find the square root of 729 by the Prime Factorisation Method.

To find the square root we will do the prime factorization of 729.

$729=3\times 3\times 3\times 3\times 3\times 3$

Taking square root on both sides, we get:

$\sqrt{729}=\sqrt{3\times 3\times 3\times 3\times 3\times 3}$

$\Rightarrow \sqrt{729}=3\times 3\times 3=27$

Hence the square root of 729 is 27.