is
Returns true if this BigInteger is probably prime, false if it's definitely composite. If certainty is 0, true is returned.
Return
true if this BigInteger is probably prime, false if it's definitely composite.
Parameters
certainty
a measure of the uncertainty that the caller is willing to tolerate: if the call returns true the probability that this BigInteger is prime exceeds (1 - 1/2<sup>certainty</sup>). The execution time of this method is proportional to the value of this parameter.