Even number is another name for even number in mathematics. In mathematics, it can be expressed as 2n (n is a positive integer) as opposed to singular. Even numbers must be divisible by 2. It is worth noting that 0 is an even number (in 2002, the International Mathematical Association stipulated that 0 is an even number, and in 2004, China also stipulated that 0 is an even number).
Even numbers often appear in the process of language development, meaning "two", "one pair" and "one pair". They are the same forms of words expressing quantity as singular numbers, plural numbers (or even most), such as ancient Greek, old English and old Russian.
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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.
Now the concept of even numbers no longer exists, but only remains in some languages with a small range of use, such as Sanskrit, Hebrew, Arabic and so on. Some languages also have zero or three numbers, such as Sursurunga.
In contrast to the plural, in some languages, the singular refers to a single quantity represented by the word itself. For example, in English, countable nouns have both singular and plural forms, meaning that one person or thing is singular and more than one person or thing is plural.