Just as the reciprocal of the number 2 is 1/2, or 0.5, the reciprocal of the square root of 2 is the square root of 1/2. This is represented numerically as 0.707106781186...
Try it again, this time using numbers which will yield whole-number results.
For example, take the number 64. The reciprocal of 64 is 1/64 or 0.015625.
The square root of 64 is 8, and the reciprocal of 8 is 1/8 or 0.125.
Note that the square root of 0.015625 is 0.125.