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How long is the longest prime number?
The largest known prime number is 17,425,170, although technically, there is no largest possible prime number. To this day, mathematicians are still searching for higher prime numbers.
Can there be prime numbers over 1 million?
Yes. In fact the largest known prime contains 9,808,358 decimal digits. http://primes.utm.edu/largest.html Slump Virus MOGWAII: Actually, as of this year (2010), the largest prime number found is 12 978 189 decimal digits long. Want to download it?
What the largest even number you can make with 6904?
I suspect that it is 6^940 which is 731 digits long. The largest through reordering the digits is only 9640.
Is it true that if you add 2 prime numbers you always get an even number?
As long as one of the numbers isn't 2, adding any two prime numbers results in an even number. Why? 1.) Adding any two odd numbers gives an even number, 2.) adding an odd and an even gives an odd, and 3.) all primes are odd, except for 2.
What are all the prime number pairs that differ by 5?
2 and 7 is the only such pair.
