Can I use only numbers in constant link in Wordpress?

Hello. Faced with such a problem. The task is to move all pages from the old site to the new URL maintaining the pages. A new website on Wordpress.
So, to create the right URL for the page no problem, but there are many pages on the source site which have a URL only numbers - for example Wordpress in this case why it adds the -2 as if such a page already exists. (it turns out ) And this happens every time when trying to set the name of the page is solely by the numbers it looks like this short video.
I was looking through the settings of permalinks is nowhere specified, all numeric value in the page address goes to -2. Is there any way to prevent?
June 14th 19 at 20:55
1 answer
June 14th 19 at 20:57
Put - everything works as it should, the truth will now have to rename a bunch of pages. The issue has been resolved!

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