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The number 4 is a natural number following 3 and preceding 5. It is a square number, specifically 2×22\times 22×2, and is the smallest semiprime and composite number. In mathematics, 4 is significant in many ways: it is linked to the four elementary arithmetic operations (addition, subtraction, multiplication, division), the four-color theorem, and the shape of a tetrahedron which has four faces and vertices. It is also the only square number where N−1N-1N−1 is a prime number. Culturally, the number 4 has meanings such as being sacred to some indigenous tribes and is considered unlucky in many East Asian cultures due to its phonetic similarity to the word for "death." In logic, four forms are used in the Square of Opposition. In religion, four represents certain key figures or concepts, such as the four matriarchs in Judaism and the 3+1 concept in Christianity. In everyday life, four appears in various common things: four sides in a quadrilateral, four limbs in humans, four wheels on standard vehicles, and four seasons in a year. This covers a broad overview of the number 4 and its significance in different contexts.