It can be, only it is not a perfect square. 72 = 7*7 = 49 and 82 = 8*8 = 64 So 63 lies between the squares of 7 and 8 and so there is no whole number whose square is 63.
There isn't a prime number between 63 and 65
54
If you mean 6 and 3 then they are 5 and 4
The integer / whole number between 63 and 65 is 64. Any number that you can write down that's more than 63 and less than 65 is a rational number between 63 and 65. There are an infinite number of them, including . . . 63.0000000001 63.01 63.1 63.99909990901 64 64.00001 . . etc.
107
It is: (63+57)/2 = 60
7 and 8
The country lies between latitudes 19° and 28°S, and longitudes 54° and 63°W.
It is: 0.625
It is: 75
The number is 63.