It can be, if its sides all have the same length.
In that case, it would also be called a 'square'.
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An hexagon is a 6 sided polygon that can be regular or irregular
It wil be a regular 18 sided polgon
180
360/18 ie 20 sides
A rectangle is considered to be an irregular polygon. This is because, in a rectangle, the sides need not necessarily all be congruent, and regular polygons must have all sides be congruent.