$\displaystyle-\sqrt{{{36}}}\usepackage{cmbright}\Huge\$ can be written as -6, which is an integer, and can also be represented as $\displaystyle-\frac{{6}}{{1}}\usepackage{cmbright}\Huge\$ . Which number cannot be represented in the form $\displaystyle\frac{{p}}{{q}}\usepackage{cmbright}\Huge\$ , where both p and q are integers?