An there be two decimal points in a number?

No, there can't ve two decimal point in a number.

you can have
9.68927

not
9.6.3328888, this is the wrong one in terms of mathematical representation of a number.

you can have Ip addresses, names of some apps or programs but they aren't decimal representation of numbers.

like

2/5 could be represented as 0.4
it could not be writen as 0.4.0

so, the overall answer is
no, a number can't have two decimal places.