How to prevent URL-modification when page title contains digits only?

Question

When I create a page whose title contains only digits - wordpress adds '-2' to the url, like it does in cases, where there is a page with the same name already existing. However this is not the case here.

Example: If I create a page titled 909303, the url will be: ../909303-2/

I want it to be ../909303/. How do I do that conveniently?