What's the square root of 49?

The story behind the answer

The square root of 49 is 7 because 7 × 7 = 49. While both 7 and −7 square to 49, the square root symbol √ denotes the principal (nonnegative) root, so √49 = 7.

49 is a perfect square (7²), part of the handy sequence 1, 4, 9, 16, 25, 36, 49, 64… Recognizing perfect squares speeds up factoring, solving equations, and geometry problems (e.g., a square with side 7 has area 49). Memory tip: think “7 days in a week for 7 weeks” → 7 × 7 = 49 days.