You can approximate a square root as a decimal or fraction. If you want the exact number, you have to leave it with the square root sign.
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No. The square roots of perfect squares are rational.
The square roots of three are examples of irrational numbers.
square roots, pi
Irrational numbers can be roots because they are solutions to certain mathematical equations. For example, the square root of 2 is an irrational number that is a solution to the equation x^2 = 2. Similarly, other irrational numbers can be roots of different equations depending on their mathematical properties.
Most square roots are irrational numbers and cannot be represented as a fraction.