How do i simplify the square root of 8 so its not a decimal?

$${\sqrt{{\mathtt{8}}}}$$

$${\sqrt{{\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{2}}{\mathtt{\,\times\,}}{\mathtt{2}}}}$$

$${\mathtt{2}}{\mathtt{\,\times\,}}{\sqrt{{\mathtt{2}}}}$$

How do i simplify the square root of 8 so its not a decimal ?

see: http://web2.0calc.com/#expand(sqrt(8)) and push the "=" Button

$$\sqrt{8} = 2^\left({\frac{3}{2}}\right)$$