You multiply the number by itself.
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all you do is multiply a number x a number = the square!
The square root of negative one is an imaginary number, signified by the italic lower-case i.
As 1 million is the lowest 7-digit number and also the square of one thousand, the number you seek is the square of 999, which I'm sure you can calculate!
The square root of 5 is approximately 2.236. It is an irrational number meaning we can not calculate its value no matter how many digits we can find. At one point a NASA computer was used to calculate the first million digits of the number.
Multiply the number of square meters by 10.7639 to get square feet.