You can look that up and see it will find the square root of any number. 1.77. The sqare root of pie is about 1.7724538509055. pi= ABOUT 3.14 Pi is an irrational number, that is it has an infinite number of digits after the decimal point. Therefore its squre root would also be irrational. However you can come as close as you with depending on how accurate you need the answer.