No. There is no way of expressing it with a fraction.
Here is the approximation in decimal form:
3.8729833462074168851792653997824
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The square root of 225 is 15, which is a rational number.
irrational
If you mean the square root of 196/225 then it is 14/15 which is a rational number because it can be expressed as a fraction.
no
No, because 15 is not a perfect square. The closest perfect square is 16, whose square root is 4.