Square Root Day 2025 Celebration. Square root day on 5/5/2025: Square root day is celebrated on the days when both date and month are the square root values of the last two digits of the year.
Square root day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year. Square root day is a unique and unofficial holiday that math enthusiasts around the world celebrate.