No, 166 is even and 2 is the only even Prime number.
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I think composite. (:
I divide 166 by 2 and get 83. I then do some tests and determine that 83 is prime, so 2 x 83 = 166.
There are six: 137, 139, 149, 151, 157, 163.
127 131 137 139 149 151 157 163.
1, 2, 4, 5, 10, 20, 83, 166, 332, 415, 830, 1660 2, 5 and 83 are prime.