six is a cardinal number (or 'counting number') used to indicate quantity or size. It follows the number five, and is preceded by the number seven.
it can refer to the numeral itself, or to any group, set, or sequence that consists of six items. For example, it is used to refer to a six-sided shape (also known as a 'hexagon'), six packs of beer, or the number of six consecutive days in a week.
1. I ordered a six pack of beer.
2. The snowflake had six different points.
3. I am going to work six days this week.