Enlargement by a non-integer scale factor

Maths

Which of these statements best describes a 'non-integer'?

A square has side length 12cm. It is enlarged by scale factor 2/5. What is the side length of the image?

A regular hexagon is enlarged by a scale factor of 3.5. The image side length is 31.5m. What is the side length of the object?

A shape is enlarged by an integer scale factor more than 1. What does not change from the object to the image?

A square is enlarged by a scale factor of 3. The object had side length 4cm, what is side length of the image?

A regular pentagon has been enlarged by scale factor 5. The side length of the image is 35mm, what is the side length of the object?