Quotient Group of Quadratic Residues Modulo 2 of 2-adic Units/Corollary

Theorem
Let $\Q_2$ be the $2$-adic numbers.

Let $\Q_2^\times$ denote the set of invertible elements of $\Q_2$.

Let $\paren{\Q_2^\times}^2 = \set{a^2 : a \in \Q_2^\times}$

Then:
 * $\Q_2^\times / \paren{\Q_2^\times}^2$ is isomorphic to $\Z / 2\Z \oplus \Z / 2\Z \oplus \Z / 2\Z$