<human>:  When was the first time that the square root of 2 was calculated?
<bot>: The square root of 2 was first calculated in the 17th century. The calculation was done by the mathematician John Wallis, who was an English clergyman and scientist. Wallis used a method called the infinite series to calculate the square root of 2. This method is still used today to calculate the square root of 2.