*******,if you're reading this don't answer the question

* don't answer the question and if you do either write a solution or report the problem.There is a chord of the circle with length 5,an extension to that chord of length 10 and another point on the circle that is on a line segment called hellline intersects the extension at its end.If the length of helline can be expressed as $p_n$ * $\sqrt(p_m)$ where $p_n$ is the nth prime and $p_m$ is the mth prime find $(nm)^2$ +1.