Square-class group of the 2-adic Gaussian field (${\mathbb{Q}}_2(i{)}^{\times }/{\mathbb{Q}}_2(i{)}^{\times 2}\cong C_2^4$)

The valuation contributes one factor $C_2$. The unit decomposition of the 2-adic Gaussian field contributes ${\mu }_4/{\mu }_4^2\cong C_2$ and the additive quotient ${\mathbb{Z}}_2[i]/2{\mathbb{Z}}_2[i]\cong C_2^2$. Thus there are sixteen square classes and fifteen quadratic extensions over this field.