1.9.. (recurring)
Yes.
No.
3.2 is the number that is closest to it. You could not get any closer!
10.025 is the closest number. You could not get any closer!
7 is the closest whole number to 7.03.
The number pi, approximated by 3.1416 is closest to the whole number 3.
3.5 is itself a number and so it is the closest number. You cannot get closer to a number than the number itself!
Numbers are infinitely dense so there can be no "closest". Given any number that claims to be the closest it is always possible to find a number that is closer.
698 is closest to 729.
It is closest to 69.
The closest prime number to 100 is 101.
Number 2 is closest to the Pyrenees Mountains.