Yes, Square is a legitimate financial technology company that provides payment processing and other financial services to small businesses and individuals. The company was founded in 2009 and is headquartered in San Francisco, California. Square is a publicly-traded company, and its stock is traded on the New York Stock Exchange (NYSE).
Square is a registered payment processor and is compliant with all necessary regulations, including the Payment Card Industry Data Security Standards (PCI DSS). Square has also obtained various certifications, such as SOC 2 and SOC 3, which are widely recognized standards for security, availability, processing integrity, and privacy of customer data.