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This early math video works great as a number of the day … Four is the second square number (a square number is an integer that can be written as the square of some other integer) and the second … Four is also the second square number after … Thus the number four is universally an integral part … Approximately four weeks (4 times 7 days) to a lunar month (synodic month = 29. 54 days). See the number 4 with objects that sometimes come to life for a fun surprise! Discover the fascinating world of the number 4! Explore its meanings, facts, religious significance, angel number interpretations, and … In mathematics, the number four is an even number and the smallest composite number.