Square Root 12345678987654321

We all know that square root of number 121 is 11. What is the square root of „12345678987654321“?

Answer:

The pattern is that the highest number, the one in the middle of the sequence such as 1234321 is the number of 1’s in the square root.

Square root of number 121 is 11
Square root of number 12321 is 111
Square root of number 1234321 is 1111
Square root of number 123454321 is 11111
Square root of number 12345654321 is 111111
Square root of number 1234567654321 is 1111111
Square root of number 123456787654321 is 11111111
Square root of number 12345678987654321 is 111111111

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