How many rational numbers are there for square to get 4 / 9? Are there any rational numbers for square to get - 4 / 9?

How many rational numbers are there for square to get 4 / 9? Are there any rational numbers for square to get - 4 / 9?

There are - 2 / / 3 and 2 / 3 rational numbers for square 4 / 9
∵ the square of any rational number is nonnegative,
The rational number of - 4 / 9 without square