偶数

1. Origins, structure, and basic meaning

• Structure: Written 偶数 and read ぐうすう, it is an integer divisible by two with no remainder.
• Basic usage: It is defined mathematically and used when an even participant count allows everyone to pair up.

2. Common pitfalls and similar expressions

• Includes zero and negative integers
  • The mathematical category is not limited to positive counting numbers.