Nothing goes into 1 but itself, it is not a Prime number, 2,3,5,7,11,13,17..... are prime numbers. 2 is the only even number that is prime.
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If we are talking positive integers, then 2 and 1. 2 goes into 12 six times, and 1 goes into 12 twelve times. 2 goes into 2 once, and 1 goes into 2 twice.
1 goes into 45
1 !
1. 1 goes into itslef once (1x1=1.) 1 goes into 20, 20 times(1x20=20.)
The only number that goes into 18 and 31 is 1.