Similar-looking connectors do not necessarily perform the same function. Before connecting a microphone to a speaker, identify the input and check the model specifications.
Answer
Generally, no. AUX usually accepts a line-level audio signal, while a microphone requires a dedicated input and signal level. Confirm that the device has an input marked MIC before connecting it.
Answer
No. Two plugs can share a diameter while carrying different signals. The input label and model manual are the correct references.
Answer
Check the input, microphone type, volume level, cable condition and manufacturer-stated compatibility. Do not force adapters or connectors.
In one sentence
Look for a clearly marked MIC input; AUX alone does not confirm microphone compatibility.