338

338 is a natural number that follows 337 and precedes 339. In mathematics it is used as a standard integer and appears in various contexts such as counting, modular arithmetic, and sequence indexing.

Its prime factorization is 2 × 13^2, which makes 338 even and not square-free. The divisors of 338 are 1, 2, 13, 26, 169, and 338. In different numeral systems it is represented as binary 101010010, octal 522, and hexadecimal 0x152; in Roman numerals it is CCCXXXVIII.

Historically, 338 BCE is notable for the Battle of Chaeronea, where Philip II of Macedon defeated Thebes and Athens. In the year 338 CE (common era), following the death of Constantine the Great, his sons Constantine II, Constantius II, and Constans I governed the Roman Empire, a period associated with political reorganization in late antiquity.

In modern usage, 338 appears in product designations and as a designation for several rifle cartridges, notably the .338 Winchester Magnum and the .338 Lapua Magnum, which are widely used in long-range precision shooting.