Yes.
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Any, and every, irrational number will do.
No irrational number can turn into a rational number by itself: you have to do something to it. If you multiply any irrational number by 0, the answer is 0, which is rational. So, given the correct procedure, every irrational number can be turned into a rational number.
No. Every real number is not a natural number. Real numbers are a collection of rational and irrational numbers.
No. A rational number is any terminating numeral. A repeating decimal is irrational.
Absolutely. Only fractions can be irrational, numerically speaking (people can also be irrational, but that's a different use of the word).