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**Co-Prime numbers are numbers which has no common factor except the number one(1) i.e., their H.C.F. is 1 only.**

**Factors of 231 = 3×11×7×1**

**Factors of 396 = 3×3×11×2×2×1**

**Here, The common factors (H.C.F.) is 1, 3 & 11.**

**Hence, the two nos. 231 & 396 are not co-prime numbers.**

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231 It is easy to see that 3 is a factor of that as sum of digits is divisible by 3

396 is also divisible by 3 - same principle

so they are not co prime, as 3 is a common factor.

396 is also divisible by 3 - same principle

so they are not co prime, as 3 is a common factor.

*The numbers are said to be co prime, if they do not have a common factor other than 1.*

*Factors of 231 are=1,3,7,11................231.*

*Factors of 396 are=1,2,3,11.................396.*

*Here common factors are 1,3 and 11.*

*Therefore the numbers 231 and 396 are not Co- Prime numbers.*

*Hope it helps!*