Even number: It is another name for positive even number in mathematics. Mathematically, as opposed to even numbers (positive even numbers), it can be expressed as 2n (n is an integer greater than or equal to 0).
Composite number: refers to the number of natural numbers that can be divisible by other numbers except 1 and itself (except 0). In contrast, it is a prime number, and 1 is neither a prime number nor a composite number. The smallest composite number is 4. Among them, the perfect number and the number of blind dates are based on this.
Extended data:
The difference between odd and even.
There is a difference between odd and even numbers, not as some people say: the main difference lies in the occasion of use. But because odd copies and even numbers are generally used as mathematical terms to classify all integers; Even and odd numbers are only positive integer straight numbers, so they are often heard because negative numbers are not mentioned in ordinary daily language.
Even numbers are usually regarded as auspicious numbers (some numbers may be exceptional because of homophonic, such as "4"). For example, "yes man" is one of the most commonly used blessing words in China. In many areas, two-day marriage is chosen, while in western countries, even numbers are regarded as unlucky numbers.