Yes
That's the "square" of the number. With counting numbers, the square will always be another counting number.
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=== === No === ===
when you subtract one square number with another the answer is 16 what are the two numbers
4 and 9
The square numbers are: 16-4 = 12
Another square number.
all of the numbers, except the numbers 1 and below
No, but only in the case of the number 1 (12=1) are square numbers odd.
16 and 4
No, and I can prove it: -- The product of two rational numbers is always a rational number. -- If the two numbers happen to be the same number, then it's the square root of their product. -- Remember ... the product of two rational numbers is always a rational number. -- So the square of a rational number is always a rational number. -- So the square root of an irrational number can't be a rational number (because its square would be rational etc.).
The numbers are 9 and 25. (If you allow zero as a square 02 = 0, then 0 and 16 are another pair.)