There are 304.8 millimetres in a foot
$${\frac{{\mathtt{27\,800}}}{{\mathtt{304.8}}}} = {\mathtt{91.207\: \!349\: \!081\: \!364\: \!829\: \!4}}$$
There are 91.2 feet in 27800mm but neither of these conditions is square.
The square bit does not make sense.
