Yes, the only four-sided regular polygon is a square, because all of its angles and sides are congruent. This does not apply to a trapezoid, so it is irregular.
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A trapezoid is one of themquadrilateral. probably irregular quadrilateralA trapezoid
-- trapezoid -- triangle -- irregular quadrilateral -- pentagon -- hexagon etc.
Any 4 sided polygon is a quadrilateral. The square, rectangle, rhombus, trapezoid and parallelogram are special cases of the quadrilateral. Any other 4 sided polygon is an irregular quadrilateral.
An irregular quadrilateral has four sides, but they can be of any length and contain any angle. An irregular quadrilateral is a four-sided polygon that is not defined as a square, rectangle, trapezoid, parallelogram, rhombus, or kite.
The definition of a irregular polygon is any polygon that is not a regular polygon.