YES 191 is a Prime number.
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191 is a prime number. It is only evenly divisible by itself and one.
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.
8977 is not a prime number. Other than itself and 1, it is divisible by 47 and 191.
The twin prime of 191 is 193.
No. 573 can be divided by 3 (which equals 191).