More than two senses are necessary to prove that something is not an illusion.
Let me explain with a example…. If we get bad smell from food, we taste it and confirm that it is bad. If we listen to horn, we see the vehicle and prove its existence. Even blind person hears the sound and touches to prove presence of someone.
For a change, let us think in a different way. At infinite senses, possible number of illusions in a mind would be zero and that would be a super-conscious state.