You said your book is on Lulu, so here is what Lulu says about ISBN:
Quote:
What are ISBNs and do I need one?
An ISBN (International Standard Book Number) is a controlled, 10- or 13-digit identification number allowing publishers, libraries, and book dealers to locate books. If you received an ISBN from Lulu, the ISBN will include Lulu's prefix and Lulu will be listed as the publisher of record. If you assigned an ISBN that you own to the project, your publisher information will be listed. For more information on the history and purpose of ISBNs, see http://www.isbn.org. An ISBN is NOT needed to publish on Lulu (Lulu ISBNs are available for free in the Lulu Publishing Wizard).
An ISBN is needed to have a book distributed in the book industry commerce chain (extendedREACH or globalREACH). An ISBN is not required for marketREACH. Each project must have a different ISBN. A unique ISBN distinguishes between different versions of a book, helping customers to be sure that they are ordering the book they want.
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And that agrees with how I understand the ISBN to work. Head to
http://www.isbn.org and read through there FAQ, it seems to agree also.