1 = 12 < 2 < 22 = 4 and
144 = 122 < 145 < 132 = 169
So the squares of 2 to 12 (inclusive) are in the specified interval. So there are 11 perfect squares between 2 and 145.
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145
There are infinitely many, just like in base 10. In any base system, the number of perfect squares is the same. Take the natural (counting) numbers 1, 2, 3, .... Squaring each of these produces the perfect squares. As there are an infinite number of natural numbers, there are an infinite number of perfect squares. The first 10 perfect squares in base 5 are: 15, 45, 145, 315, 1005, 1215, 1445, 2245, 3115, 4005, ...
145 meters = 0.145 kilometer
145 / 40 is equal to 3.63
Concerning positive integers, 1, 5, 29, and 145 are the only factors of 145. If you go into decimals/fractions and negative integers (e.g., -5*-9), there are many more. 1*145=145 5*9=145