The two successive prime numbers are 2 and 3. 1 is not a prime number because it has only one factor, while prime numbers have two positive integer factors.
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As the number 2 is the only even prime number then a difference of 1 occurs only between 2 and 3. All other prime numbers are odd and therefore the minimum difference between successive prime numbers is 2.
There is no limit: gaps between successive primes can be arbitrarily large. As of 2014, the largest prime gap between proven primes is 1,113,106. The two successive primes at either end have 18662 digits each. A larger gap, of 3,311,852 numbers between probable primes has been conjectured.
It is impossible for the product of two prime numbers to be prime. It is impossible for the sum of two prime numbers to be prime as long as one of the numbers isn't 2.
There are two prime numbers that equals 50. The two numbers are 13 & 37. Both numbers are prime, so that's the answer.
Prime numbers have two factors, composite numbers have more than two.