To determine the sum of the interior angles of a hexagon, we can use the formula:
\[ \text{Sum of interior angles} = (n - 2) \times 180^\circ \]
where \( n \) is the number of sides in the polygon.
For a hexagon, \( n = 6 \):
\[ \text{Sum of interior angles} = (6 - 2) \times 180^\circ = 4 \times 180^\circ = 720^\circ \]
Therefore, the sum of the interior angles of the hexagon is \( \boxed{720^\circ} \).