Up to 4 household members may share Amazon Prime membership (not including Amazon Student)
Quote :... If you sign up for a free trial or paid Prime membership (not including Amazon Student memberships), you may invite up to four eligible household members (living at the same address) to enjoy the shipping benefits of your free trial or paid Prime membership at no extra cost (invitees). (Please note that any member under age 18 may use the Amazon.com Web site only with involvement of a parent or guardian.) If you purchase a Prime membership for use by a business or organization, you may invite up to four eligible coworkers to shop for the related account consistent with these Terms and Conditions.
The purchaser can change and/or remove invitees at any time. An invitee's shipping benefits will automatically terminate if the purchaser of the membership ceases to be a member or removes the invitee. Free promotional programs related to Prime may not include invitee benefits. ...