A page number refers to the specific number assigned to a page in a book, document, or publication. It helps readers easily locate a particular page when they want to reference or find specific information within the text. Full definition
Including page numbers in an eBook is not allowed per most online retailer guidelines. (bbebooksthailand.com)
I must say the old way taught me the long lost art of remembering page numbers of several books at the same time. (goodereader.com)
You might make an exception for page numbers on opening chapter pages if you have many short chapters and there's a risk of your readers getting lost. (bookworks.com)