In Word, it is difficult to set it e.g. to the first four pages have no page number, but the fifth page should begin with page number 5.

• The official solution is to start a new section after the first pages, and here we set the section numbering to start with page 5.
• The unofficial method is to not care about it and then simply cover the page numbers of the first four pages with white squares before creating the PDF.

The same can be done e.g. also with blank pages in front of the chapters. It's nicer if it's completely blank, with no page number.