If you have a column where you want to remove all numbers from every cell where they appear, you can do it very quickly and easily with regexp_replace in QGIS. Sure, you can trim any set number of digits off the end of a text string but if the number of digits vary, or if you don't have numbers in every cell then it can get very messy and wrong. That's why I'm showing you this method.
See my intro and intermediate QGIS courses for more: https://www.udemy.com/user/alasdair-r...