Answer:
This might not be the best answer but here goes:
A perfect square has to be a number that is expressed by 2 of the same integer multiplied by each other.
To check if a number is a perfect square, you find the square root of it. 64006 does not have a whole square root, meaning it is not a perfect square number. Its square root is:
252.9940711... (very close but not quite whole)