[Colin2B]

Doesn't the fact that Pi is not a clear-cut whole number, mean that the Universe is not 3-dimensional?

Not at all.
3 dimensional means defined by 3 dimensions (each having its own number). It has nothing to do with a single number that just happens to be close to 3.
You are confusing things which are not the same.

[Bored chemist]

Do you think there's something disturbingly wrong about Pi not being a whole number?

I mean, why isn't it a simple whole number, like 3.  If it was, that would make sense in a 3-dimensional Universe.

In such a Universe, the 3 dimensions - length, breadth, height  ( or equivalent terms for these properties )
would surely be capable of clear-cut representation by the numbers: 1, 2, 3.  There wouldn't be any "fuzziness"

Doesn't the fact that Pi is not a clear-cut whole number, mean that the Universe is not 3-dimensional?

If you calculate the ratio of the edge of a square to the diagonal you  will find it is also irrational. It's the square root of two, about 1.414......