A company needs to distribute 64 promotional items equally among its 8 departments. If each department receives an equal number of items, how many items does each department receive? Additionally, if one department decides to give back 2 items to the company, how many items does that department have left? Finally, calculate the square root of the total number of items that were given back to the company. Let's think step by step and output the final answer within \boxed{}.
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