Q: Is 2,618,721 a Prime Number?
A: No, 2,618,721 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 2618721 can be evenly divided by 1 3 7 9 21 63 197 211 591 633 1,379 1,477 1,773 1,899 4,137 4,431 12,411 13,293 41,567 124,701 290,969 374,103 872,907 and 2,618,721, with no remainder.
Since 2,618,721 cannot be divided by just 1 and 2,618,721, it is not a prime number.