An integer is a number that is not a fraction so no 3.7 is not an integer
66mm=6cm
So that means that any 66mm is 6cm point 6mm ===> 66cmm=6.6cm
Thus, 6cm is not greater but it is equal to 66mm
It's like you looking at 1yd=3feet which also means that 3feet=1yd.
(y + 7)(y + 7)
49 is a perfect square of 7
it can also be written
(y + 7)²
hope this helps :)