It helps if you can see the non-printing characters. To make them display, click on the Paragraph Symbol mark in the Paragraph section of the Home tab.
You can select that paragraph symbol with the mouse. At that point you can click on Bold and also another color if you’d like. Any formatting you apply will only be to the number, not the text.
To suppress the display of non-printing characters, just press on the Paragraph Symbol again on the Home tab. (You can also use Ctrl+*)