An IQ of 1000 is considered to be theoretically impossible as the highest recorded IQ score is around 228, this is based on the standard deviation of the normal distribution, which is set at 15 points. An IQ score of 1000 would be well beyond what is considered to be the upper limit of human intelligence.
It's important to note that intelligence is a complex trait and can't be measured by a single number like IQ. Additionally, the concept of a "super-intelligent being" is largely a work of fiction and the reality of such a being would likely be vastly different from what is portrayed in popular media.
If such a being existed, it is likely that they would have an extraordinary ability to reason, solve problems, and learn from experience. They would have a high level of creativity, curiosity, and abstract reasoning. They would probably have a deep understanding of mathematics, physics, and other sciences, as well as an ability to learn new things quickly and easily.
It's also important to consider that intelligence alone doesn't guarantee success, happiness or even survival, as social and emotional intelligence, as well as other personal characteristics, are also important in life.