No number does...
32 - 22 = 5
42 - 32 = 7
52 - 42 = 9
62 - 52 = 11
72 - 62 = 13
82 - 72 = 15
As you can see the difference of squares skips right over 12
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The two square numbers with a difference of 21 are 25 and 4. This is because (5^2 = 25) and (2^2 = 4), and their difference is (25 - 4 = 21).
The numbers are 18 and 12
12 and 15
12 and 2
To simplify the square root of 12: Look at numbers that can be reduced from the larger number and can be square rooted itself. 4 * 3 = 12 The square root of 4 is 2. Therefore the simplification of the square root of 12 is: 2*square root of 3