7×19

7×19 denotes the product of the numbers 7 and 19. In arithmetic, it is read as seven times nineteen or seven by nineteen, and equals 133.

The number 133 has a simple factorization: 133 = 7 × 19. This makes 133 a semiprime, a natural number that is the product of exactly two primes. Both factors, 7 and 19, are themselves prime numbers.

In two-dimensional contexts, the notation 7×19 is commonly used to specify dimensions, such as a grid, a format, or physical measurements. When applied to matrices, a 7×19 matrix has 7 rows and 19 columns, and thus contains 133 entries.

In specialized or historical domains, the format "7×19" can appear as a size or designation in cataloging, equipment specification, or product labeling. Such usage is context-dependent and not part of a universal standard like 9×19mm Parabellum in firearms. Details, when encountered, should be verified with authoritative source material for the specific field or item in question.

Overall, 7×19 is primarily encountered as a straightforward arithmetic product, with secondary relevance in describing two-dimensional sizes or structures.