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The number 4 is a natural number that follows 3 and precedes 5 in the number sequence. It is the smallest composite and semiprime number, as well as a square number (2 × 2). In mathematics, it is significant for many reasons: it is part of the four basic arithmetic operations (addition, subtraction, multiplication, division), it represents the smallest number of square numbers needed to sum up to any positive integer (Lagrange's four-square theorem), and it corresponds to the four dimensions in Minkowski space (3 spatial dimensions and 1 time dimension). In geometry, a four-sided shape is called a quadrilateral or tetragon, and the simplest polyhedron with four faces and vertices is a tetrahedron. In various cultures, the number 4 holds symbolic meanings and is sometimes considered unlucky in East Asian cultures due to its pronunciation resembling the word for "death." Overall, 4 is a fundamental number with broad mathematical, cultural, and symbolic significance.