To simplify \(\sqrt{125}\), we can start by factoring 125 into its prime factors:
\[ 125 = 25 \times 5 = 5^2 \times 5 \]
Now we can take the square root:
\[ \sqrt{125} = \sqrt{25 \times 5} = \sqrt{25} \times \sqrt{5} = 5\sqrt{5} \]
Therefore, \(\sqrt{125}\) simplified is \(5\sqrt{5}\).