You have asked a very deep mathematical question with no simple answer. It will take you some reading and study to get an answer that satisfies.
Infinity is not a "number" like 0 or 1 and the properties of infinity are different from numbers, If you want to get a start on the answer, you need to find about what G. Cantor wrote. Let me give you a start.
Which set is bigger? The set of all natural numbers or the set of all even natural numbers. The answer: both sets have the same number of elements. Also the number of rational numbers has the same number of elements as the natural numbers and Cantor gave that number a name. Then the real kicker (pun intended) is that there are more real numbers than rational numbers, and Cantor gave that number a name too.
Do some reading!
