How to determine if the conversion rate is high or low?

The test is to trace CTR.

Only variation has button so the test results as below:

Original - Visitors: 120170, Conversion rate: 0

Variation - Visitors: 121058, Conversion rate: 15256

Next step is to evaluate the test results, now I wonder what measurement can i use to know whether 15256 is consider high or low (significant or not?), should we implement this button in the system? It would be highly appreciate to listen some feedback from expert who has any background or experience on this.

Thanks.