YES!. 11 is a prime number. Here are some prime numbers from the smallest:

2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71,73, 79, 83, 89, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197, 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313, 317, 331, 337, 347, 349, ........etc.

A prime number is NOT DIVISIBLE EVENLY by any other number, except by itself and 1. Example:

11 is a prime number and is divisible only by itself =11/11 =1, or by 1 =11/1 =11. And that is it.

This is the definition of a "prime number".

And 1 is not a prime number.