No, Jupiter is not considered a brown dwarf. Jupiter is classified as a gas giant planet, not a brown dwarf. Brown dwarfs are often referred to as "failed stars" because they have characteristics similar to both planets and stars. They are more massive than planets but less massive than stars, typically ranging from about 13 to 80 times the mass of Jupiter.
Jupiter, on the other hand, is the largest planet in our solar system, with a mass that is approximately 318 times that of Earth. It consists mostly of hydrogen and helium, similar to a star, but it is not massive enough to sustain the nuclear fusion reactions that power stars. Therefore, Jupiter does not emit its own light like a star or a brown dwarf.
The distinction between planets and brown dwarfs is based on their mass, formation process, and internal structure. While Jupiter and brown dwarfs share some similarities, they are considered distinct objects in astronomy.