Can a rectangular tile with a length of 3 decimeters and a width of 2 decimeters not be a square? If so, how many decimeters is the minimum side length of the square? At least how many such tiles are needed?

Can a rectangular tile with a length of 3 decimeters and a width of 2 decimeters not be a square? If so, how many decimeters is the minimum side length of the square? At least how many such tiles are needed?

Six decimeters, six dollars