Infinity isn't a number, thus it can't be prime.
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There is no biggest prime number: they go on for ever.
Infinity is an unknown number so nobody knows what it is. A prime number has only 2 factors which are 1 and itself. Composite numbers are everything else except 1 and 0. 1 and 0 are neither prime, nor composite.
Prime numbers as with any number, go to infinity. However if it helps, the first few are 2,3,5,7,11,13,17,19
There is ONly ONE prime number that is EVEN. It is TWO(2). All other prime numbers to infinity are odd.
The multiples of 2 are 2, 4, 6, 8, 10, etc., including every even number to infinity,