If I go to the office of a small business and ask for the human resource number, Is it by law they give me this information? Or do the have the right question me over what matter I need to contact human resources, and then decide if they should give

If I go to the office of a small business and ask for the human resource number, Is it by law they give me this information? Or do the have the right question me over what matter I need to contact human resources, and then decide if they should give me the information or not?