Prime numbers with hundreds of digits have been found, but there are still
more to come that haven't been found yet.
It's not possible to add up all the prime numbers, because nobody knows
what they all are yet.
Since there is no last Prime number (this was proved 2000 years ago by Euclid), the sum of all prime numbers is infinite.
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The sum of the all prime numbers from 1 to 100 is 1,161
The sum of all the prime numbers less than 201 is 4,227.
The sum of all prime numbers between 10 and 16 is 41.
The sum is 1,060
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.