220 में कौन-सी न्यूनतम संख्या को जोड़ने पर योगफल पूर्ण वर्ग होगा? What least number should be added to 220 to make it a perfect square?

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220 में कौन-सी न्यूनतम संख्या को जोड़ने पर योगफल पूर्ण वर्ग होगा? What least number should be added to 220 to make it a perfect square?