2 is the natural number that comes after 1 and before 3.

Mathematically:

• It is the smallest and first even number.
• It represents a quantity of two items.
• It can be written as 1 + 1.

Examples:

• 2 apples 🍎🍎
• 2 days
• 2 people

In mathematics, 2 is also the only even prime number.