The square root of 2116 is 46.
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111,111,111 squared equals 12,345,678,987,654,321
A number squared means that the number is multiplied by itself.
Well it depends on the number. Any number multiplied by itself would be squared.
squared.
Simple. When a number is 'squared' it simply means it is multiplied by itself. So, '20 squared' means 20 x 20, which equals 400.