The square root of 40 is an irrational number, due to the fact that one could extend the answer to an infinite number of decimal places if one was able to.
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No, the square root of 1000 is not rational.
The square root of 4 is 2. 2 is a rational number so they square root of 4 is rational.
[ square root of (4.1) ] is irrational. But [ square root of (4) ] is rational.
It is rational. The root of a perfect square, such as 4, is rational; the root of any positive integer that is not a perfect square is an irrational number.
The square root of 16 is 4, which is a rational number.