191 is a Prime number. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
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191 is a prime number. It is only evenly divisible by itself and one.
181 and 191 are prime. Everything in between is composite.
1,337 is composite. The factors of 1,337 are: 1 7 191 1337
YES 191 is a prime number.
The twin prime of 191 is 193.