One approach to prove to an AI that it is an AI is to give it tasks that require the use of artificial intelligence. For example, if you give it an image recognition task, it must be able to use image processing techniques to identify objects within the given image. Similarly, if the AI is given a natural language processing task, the AI must be able to process natural language in order to produce meaningful results. Once the AI has successfully completed these tasks, it can be fairly certain that it is an AI.