(it is still written that way in modern chinese.. The number 2 is an even number because it is divisible by 2 without a remainder.
A west arabic numeral, ultimately from indic numerals (compare devanagari २ (2)), from a cursive form of two lines to represent the number two.. The glyph currently used in the western world to represent the number 2 traces its roots back to the brahmin indians, who wrote 2 as two horizontal lines.