From the fact that virtually every galaxy is moving away from us and more distant galaxies are moving away from us at a faster rate than closer ones, what do we conclude?

According to the big bang theory, the galaxies, the solar system, the planets, all started from a single point, commonly known as the Singularity. From that point, the universe is continuously expanding and this is the reason why the galaxies, and other distant galaxies are moving further. The space itself is expanding more and more with time.

81 is a composite number.