Lucky Numbers 数字 (shù zi)
Do you know which number 数字 (shù zi) is the lucky number in China?
Well, as a rule, it is customary to regard even numbers are more auspicious than odd numbers in China. Thus, guests will always give even-numbered presents.
Since the number two 二 (èr) usually suggests germination and harmony, decorations are invariably set out in pairs at wedding celebrations like a pair of red candles, a pair of pillows, and couplets hung on two sides of the hall.
Six 六, pronounced as ‘liù’, conveys the meaning “do everything smoothly”.
Eight or “八 (bā)” in Chinese has a similar sound to ‘fā’, and so has the connotation of making a fortune. Chinese business men favor this number very much.
However, four or “四”(sì) is the exception to the even number rule as it sounds like “sǐ” (death), so when choosing car license tags, phone numbers and room numbers people try to avoid it.
For odd numbers, nine or “九” (jiǔ) is an exception as it sometimes means longevity and eternality.
From Ninhao.com