Square Root of 4
The square root of 4 is about 2. Square roots reverse squaring and are essential in geometry and the quadratic formula.
√4 = 2 exactly: 4 is the square of 2, so the table shows the whole truth with no rounding at all. The ladder around it confirms the fit — 1 sits 3 below and 9 sits 5 above, gaps that widen by exactly two at every rung. The geometry backs the number: a square with side 2 covers exactly 4 square units of area, the picture behind every fact on this page. The modular checks agree as well: divided by 9, 4 leaves 4, one of the 0, 1, 4, 7 remainders every square is allowed.
| Expression | Value |
|---|---|
| √4 | 2 |
Frequently asked questions
What is the square root of 4?
The square root of 4 is about 2. It is the number that, multiplied by itself, gives 4.
Is 4 a perfect square?
Yes — 2 × 2 = 4, so 4 is a perfect square and its square root is exact.
What does √ mean?
√ is the radical sign, short for square root. √4 asks: which number times itself equals 4? Here the answer is about 2.