If your page numbers have been input in the document body instead of in the page header or footer, then the number/field on each page will have to be removed individually. If they're in the header or footer, the most you'll need to do is remove a single instance from each header or footer and, if your document has multiple sections, that means deleting from each header or footer that isn't linked to the previous one.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]