Square Root 12345678987654321

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?




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In a classic wine shop, the list of three most popular wines are:
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Can you find the least possible number such that

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In 2007, a puzzle was released and $2 million prizes were offered for the first complete solution. The competition ended at noon on 31 December 2010, with no solution being found. Wiki