No
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The square root of 61 is an irrational number
the square root of 61 is about 7.81.
The square root of 48 is a rational or irrational
Yes, it is the principal square root of 4, and it is rational.
The square root of 2.56 is rational. This is because 2.56 can be expressed as 256/100, which simplifies to 64/25. The square root of 64 is 8 and the square root of 25 is 5, so the square root of 2.56 is 8/5, which is a rational number.