Is DQN limited to working with only image frames?

Question

I have few questions about Deep Q Network.

1. Does DQN only accept image frames as input? I have never hear (read) a paperwork where it doesn't use image frames.

2. If the first is a No, then does image frames as input for training faster than any other options? For example, in any atari game, is frames input faster to train while having the same perfomance quality?

I know an image frames is but numbers too, like other datas, but from what I know even a low quality frame is considered huge.