$${\sqrt{{\mathtt{2}}}}$$ is an irrinational number that goes on forever. To be accurate, you leave it as $${\sqrt{{\mathtt{2}}}}$$
Here is what this website say $${\sqrt{{\mathtt{2}}}}$$ is: $${\sqrt{{\mathtt{2}}}} = {\mathtt{1.414\: \!213\: \!562\: \!373\: \!095}}$$