An Integer?
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The best classification is that it is "the real number -14". Any other classification is less good because it will be less precise: some other number will also qualify.
A square. All squares are parallelograms, but not all parallelograms are squares.
Real number
A parallelogram is in the class of 4 sided quadrilaterals
The best classification for a parallelogram that has perpendicular diagonals is a rhombus. A rhombus has four sides that are congruent. The also diagonals bisect the vertex angles of this type of parallelogram.