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"Bestseller" books aren't associated with a specific number of sales, and bestseller lists can have very different (and sometimes arbitrary) parameters.
The Book Sense bestseller lists, for example, use sales numbers from independent bookstores, while the New York Times uses both wholesale and retail sales records from many sources. Amazon.com compiles its lists solely from its own sales records.

en.wikipedia.org/wiki/Bestseller

A bestseller is a book that is included on a list of top-selling or frequently- borrowed titles, ..... For example, a "summer bestseller" is usually determined long before the summer is over, and signals a book's suitability for millions of lounging ...

en.wikipedia.org/wiki/The_New_York_Times_Best_Seller_list

The New York Times Best Seller list is widely considered the preeminent list of best-selling ... In July 2000, the "Children's Best Sellers" was created after the Harry Potter series had stayed in the top spots on the .... Thus, the list can become self-fulfilling in determining which books have high sales and remain on the list.

www.quora.com/How-is-The-New-York-Times-bestseller-list-determined

The best way to get on the bestseller list: Selling a lot of books in a short span of time. Having said that, Wikipedia enlightens us with: "The exact methodology used in ...

www.slate.com/articles/news_and_politics/book_blitz/2004/10/whats_with_all_the_national_best_sellers.html

Oct 15, 2004 ... Walk into a bookstore, and it can seem as though every book is billed as a " national best seller." It's not hard to explain why: There are ...

www.bookpromotionhub.com/6103/how-many-books-do-you-need-to-sell-to-become-a-bestseller

Bestseller” is a manipulated term. If you want to be a bestselling author, take out a $100000 loan and buy 15000 of your own books from Amazon." ? Patrick.

observer.com/2016/02/the-truth-about-the-new-york-times-and-wall-street-journal-bestseller-lists

Feb 4, 2016 ... What really goes on with the two top bestseller lists?

www.makeuseof.com/tag/8-things-people-dont-know-amazons-bestsellers-rank-sales-rank

Please bear in mind that Amazon does not explicitly state how the Bestsellers Rank is calculated. The information below is based on research, deduction, and ...

www.forbes.com/sites/jeffbercovici/2013/02/22/heres-how-you-buy-your-way-onto-the-new-york-times-bestsellers-list

Feb 22, 2013 ... A debut at the top of The New York Times bestsellers list. These are the things every author craves most, and while the first two require the favor ...

www.fastcompany.com/1813678/what-being-bestselling-author-really-means

Feb 3, 2012 ... Whether you are a business owner, a speaker, or a full-time author, being able to call yourself a bestseller dramatically increases your ...