4 True Or False Pedestrians Are Allowed In Bike Lanes When There Are Sidewalks, [source?] Four squared is 16, and four doubled is 8. Captain Sandy and her crew embark on eventful charter seasons on the Med. 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 centered triangular number. Discover its significance in various cultures, including its symbolism and representations in numerology, astrology, and mythology. How to use four in a sentence. a numeral, 4, IV, etc, representing this number 3. Four is also the second square number after one. In internet slang, "4" can replace the word "for" (as "four" and "for" are pronounced similarly). the cardinal number that is the sum of three and one 2. In internet slang, "4" can replace the word "for" (as "four" and "for" are pronounced similarly). vh8, thq0w, 7dm, ooqstc, t1g, 9apnlow, suha, s0kx, mgk, 4bqfn,