Q: Is 2,721,645 a Prime Number?
A: No, 2,721,645 is not a prime number.
A prime number is a natural number, greater than one, that can only be divided by 1 and itself.
The number 2721645 can be evenly divided by 1 3 5 9 15 31 45 93 155 279 465 1,395 1,951 5,853 9,755 17,559 29,265 60,481 87,795 181,443 302,405 544,329 907,215 and 2,721,645, with no remainder.
Since 2,721,645 cannot be divided by just 1 and 2,721,645, it is not a prime number.