\[\sqrt{x} = 0 \Longrightarrow x = 0\]
\[\sqrt{x} = 1 \Longrightarrow x = 1\]
\[\sqrt{x} = 5 \Longrightarrow x = 25\]
\[\sqrt{x} = 2,3 \Longrightarrow x = 5,29\]
\[\sqrt{x} = 3 \Longrightarrow x = 9\]