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Question: What is Rectangle Number ?

Answer:

When a number of counters can be displayed in a rectangular pattern with more than one row or column, then the number concerned is called a rectangle number. It has at least two factors other than 1, such numbers are also called composite. They are never prime, but may be square.

A number that can be shown as a pattern of dots which are in the shape of a rectangle. Such a number must have at least two factors bigger than one.

Seven is not a rectangular number (factors 1 and 7), whereas ten is (factors 2 and 5).