2186

2186 is an integer that may refer to several topics in different disciplines. In historical contexts it is used as a year notation in the Common Era, while in mathematics it denotes a specific number with distinct factorization.

As a year, the calendar year 2186 CE would be in the 22nd century. It is not a leap year, since 2186 mod 4 equals 2, so it would have 365 days. It would be the 86th year of the century, which spans from 2101 to 2200.

In mathematics, 2186 is composite and equals 2 × 1093, with 1093 prime. Therefore, 2186 is a semiprime. The prime 1093 is notable in number theory as a base-2 Wieferich prime; such primes satisfy that 2^{p-1} ≡ 1 mod p^2.

Beyond calendars and pure math, 2186 can appear as a code or identifier in various systems, including model numbers, catalog entries, or numerical labels.