The one that is prime.
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Prime numbers have exactly two factors. 53 and 59 are prime numbers.
Prime numbers. Their only two factors are 1 and themselves.
A prime number is a positive integer that has exactly two different factors: 1 and itself. This is why 1 is not a prime number: it has the factors 1 and itself, but they are the same - it does not have exactly two different factors.
Each of the 25 prime numbers from 1 to 100 has exactly two factors, 1 and the number itself. The other 75 numbers from 1 to 100 are not prime numbers because none of them have exactly two factors.
Finding those numbers which divide exactly (with no remainder) into all of the two or more numbers.