Jupiter's closest moon which is Io is 421700 kilometers away from it
1,883,000 km
Yes. As far as I know, all of Jupiter's moons (and all other moons in the Solar System) have craters.
Jupiter has about 63 Moons, discovered so far.
Io orbits at a radius of about 421,700 km from Jupiter
Im not sure which moon of Jupiter your are talking about, because Jupiter has 63 moons. But the moons are about 22572172.8 miles from the sun.
No planet has 4 moons. (planets as far as in our solar system)
Jupiter is thought to have the most moons, a total of 63 have been confirmed so far.
63 that are known of so far
Callisto is the 2nd largest and 8th closest of Jupiter's known moons, with an orbit about 1.8 million km from Jupiter. It was discovered by Galileo in 1610 and is the most distant from Jupiter of the 4 large Galilean moons. Jupiter's large moons orbit rapidly compared to Earth's Moon. Callisto circles Jupiter every 16.7 Earth days.
Jupiter and Saturn each have 60 or more known moons. In Saturn's case, there are many small moonlets in the ring system. In Jupiter's case, a number of small moons (likely captured asteroids) have comparatively long and elliptical orbits far from the planet.
Jupiter's moons do not have moons. No moon in the Solar System has a moon orbiting it.
So far, Jupiter is leading with 63 named moons. Since it is the largest planet, you would expect it to have the most moons.