The roots of $ z $ are:
$$ \sqrt{z} = 1.1982+0.828i $$ $$ \sqrt{z} = -1.1982-0.828i $$The square roots of $ z = a + bi $ are:
$$ z_1 = \alpha + \beta i ~~~\text{ and }~~~ z_2 = -\alpha - \beta i $$where:
$$ \alpha = \sqrt{\frac{a + \sqrt{a^2 + b^2}}{2}} ~~~\text{ and }~~~ \beta = sgn(b) \sqrt{\frac{-a + \sqrt{a^2 + b^2}}{2}} $$( In this example we have $ a = \frac{ 3 }{ 4 } $ and $ b = \frac{ 198431 }{ 100000 } $ )