Well, first of all, every positive number has two square roots. Their digits are the same, but one is positive and one is negative.
The square root of 343 is an irrational number, so it can't ever be exactly written with digits. As a decimal, it never ends or repeats, and as a fraction, it can't be written at all.
The positive square root starts out 18.52025... and keeps going forever.
The other square root is the negative of that same number. When you multiply either of them by itself, the product is close to 343 . The more decimal places you include, the closer it gets, but it can never be exactly 343 .
