Infinitely many. There are infinitely many numbers between any two numbers - no matter how close to each other they are.
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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.
Infinitely many rational numbers and even more irrational numbers.
12
There are 9 squares I can see 12 squares in an array of 2 * 4 squares
The numbers are 12 and 14.