Fastest individual to manually calculate the square root of a random eight-digit number on paper

The record for being the fastest to manually calculate the square root of a random eight-digit number on paper was set by Kumaran Thanikasalam (born on July 9, 2003) of Kancheepuram, Tamil Nadu. He manually calculated the square root of a random eight-digit number (60750397) on paper and derived the answer with 99.86 percent accuracy in 43 seconds and 31 milliseconds, confirmed on December 4, 2024.