An oblong number is a composite (non-prime) number. If p and q are a factor-pair for an oblong number n, then the number n can be represented by a rectangle or oblong that is p units x q units.
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An oblong is a rectangle. However, an oblong is not a square. Both are rectangles because they both have 4 right angles, but a square is equal-sided and an oblong isn't.
An oblong is a rectangle BUT a rectangle isn't necessarily an oblong. There are 2 types of rectangle: 1) Square (equal sided) 2) Oblong (unequal sided) Most refer to an oblong as a rectangle and use the word 'square' to be more specific as it has different properties.
By definition, an oblong is "a quadrilateral with four right angles and two pairs of parallel lines of different lengths." A rectangle, which has a length that is more than the breadth, is an example of an oblong. By contrast, a square, is not an oblong as it has all the sides equal.
rectangle
Rectangular