A quadrilateral is not necessarily a rectangle. The only time this is not true is in the case of a square on a quadrilateral without four 90 degree angles.
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"It has four sides" is a description that does not guarantee that a quadrilateral is a square.
A square fits that description.
A quadrilateral is a polygon with four sides. A rectangle is a quadrilateral
A rectangle is always a quadrilateral and a parallelogram.
So sometimes yes A quadrilateral is a polygon with 4 sides. A rectangle is a parallelogram with 4 right angles. A quadrilateral is sometimes a rectangle. Here is an example of a quadrilateral that is not a rectangle: