@EXPODTL Open Find & Select then ALT / Click to pick up details of the number. This should give you an idea about what it is e.g. Text, Label, Dimension. You can add other criteria to the Find window to help expose where it is placed etc.
Apple iMac macOS Ventura / AC27UKI (most recent builds)
In View/On-screen View Option select to show textbox handles. That will give you black corners on the edge of textbox - you will quickly then can understand what is what. In Archicad possible to have very wide textbox with only one letter in the middle - in you case textbox possibly can be wider then even your drawing. Check is the magnet on in your arrow tool - magnet let you select the element by just clicking on it. It works with fills and text the same way - no need to search for hotspot. Also you can select tool: text, label, dimension and hotkey Ctrl+A - this way you select all texts, labels or dimensions. In worst case scenario it can be buggy library part, that shows text with the wrong scale.