It means the first four sneezes were unable to dislodge the irritant in your nasal passages that were causing the sneeze.
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It could mean you are hyper sensitive or it could mean that the thing that entered your lungs couldn't easily get out.
Just means you normally sneeze more than once
It goes in 5 times.
It means that whatever number you have you times it by three
If you mean squared(times times), then it would be 5 405 625(155 * 5 * 155 * 5). If you mean 15 * 5 * 15, that is 225 * 5, which is obviously 1125.(That can be figured out mentally, so why are you asking?)