\[\boxed{\text{310\ (310).}\text{\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[Пусть\ искомое\ число\ равно\ \text{a.}\]
\[1)\ \sqrt{a} = 0\]
\[a = 0^{2}\]
\[a = 0.\]
\[2)\ \sqrt{a} = 1\]
\[a = 1^{2}\]
\[a = 1.\]
\[3)\ \sqrt{a} = 3\]
\[a = 3^{2}\]
\[a = 9.\]
\[4)\ \sqrt{a} = 10\]
\[a = 10^{2}\]
\[a = 100.\]
\[5)\ \sqrt{a} = 0,6\]
\[a = {0,6}^{2}\]
\[a = 0,36.\]