|Hmmm, I guess it depends on your definition of a spreadsheet.|
A workbook is a spreadsheet file. By default, each workbook in Excel contains three pages or worksheets.
The term spreadsheet is often used to refer to a workbook, when in actual fact, spreadsheet refers to the computer program, such as Excel.
So, strictly speaking, when you open the Excel spreadsheet program it loads an empty workbook file consisting of three blank worksheets for you to use.
Therefore, based on that definition (as well as many others) I contend that you have a workbook with multiple sheets each of which contain a relatively small amount of data. That, in my opinion, is not the same thing as having "small separate spreadsheets on different sheets".
There are numerous definitions of "spreadsheet" available on the web. A range of cells in an Excel sheet doesn't fit any definition that I can find.