Correct. 2000 can be factored into $\displaystyle{4}\cdot{100}\cdot{5}\usepackage{cmbright}\Huge\$ , and 4 and 100 are square numbers. $\displaystyle\sqrt{{2000}}=\sqrt{{{{2}}^{{2}}\cdot{{10}}^{{2}}\cdot{5}}}={2}\cdot{10}\cdot\sqrt{{5}}={20}\sqrt{{5}}\usepackage{cmbright}\Huge\$ .