1, 3, 5,9
Any prime can be made into only one rectangle. Any composite number can always be made into at least two different rectangles.
Those would be the prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47
Only some. Only some. Only some. Only some.
Some of them are, but not all of them. A parallelogramis a rectangle only if all of its angles are equal.
A square is a specialized type of a rectangle. All squares are also rectangles, but only some rectangles are squares.
If you cut a rectangle in half you wouldn't get a solid figure at all, since a rectangle is a plane figure. If you made a straight line cut you would get either a triangle or a quadrilateral of some variety depending on exactly how the cut was made.
They are numbers, only some of whose digits are known.
Yes. A rectangle has 2 pairs of parallelogram and all of the angles are 90 degrees. If a rectangle ends up having 4 equal sides, then it is a square. Therefore, only some rectangles can be squares. (It is important to think of squares as a "special" type of rectangle!)
Nobody made them. They are a property of some integers.
The answer will depend on what those numbers represent and their units. It is possible that the question gives 18 and 5 units as the length and width of a rectangle and requires you to find the area and perimeter. Or It is possible that the question has given 18 in some units and 5 in some other units and requires you to determine which one could be the area and which the perimeter.
Prime numbers have only 2 factors while composite numbers have more than 2 factors
That depends on whether the numbers represent, inches, feet, yards, centimeters, or some other thing.