sqrt
Returns the integer square root of this BigInteger. The integer square root of the corresponding mathematical integer n is the largest mathematical integer s such that s*s <= n. It is equal to the value of floor(sqrt(n)), where sqrt(n) denotes the real square root of n treated as a real. Note that the integer square root will be less than the real square root if the latter is not representable as an integral value.
Return
the integer square root of this
Since
9
Throws
if this is negative. (The square root of a negative integer val is (i * sqrt(-val)) where i is the imaginary unit and is equal to sqrt(-1).)