The number 2 is a natural number following 1 and preceding 3. It is the smallest and only even prime number, meaning it can only be divided evenly by 1 and itself. It is fundamental in mathematics and has many unique properties, such as being the first Ramanujan prime, the first superior highly composite number, and the first colossally abundant number. Two is also the base for binary number systems used extensively in computing. The digit "2" traces its origins to ancient scripts and has various cultural and mathematical significance. In everyday terms, "two" is used as a determiner with plural countable nouns or as a noun referring to the number itself.

If your query was about the song or artistic works titled "2 On," that is a debut single by American singer Tinashe released in 2014, featuring rapper Schoolboy Q. The song is an up-tempo R&B club track with elements of electro and trap, notable for party themes and significant popularity, including chart success and certifications.

Please clarify if you sought basic mathematical/number information or specific cultural/music references related to "2."