Q: Is 3,605,721 a Prime Number?
A: No, 3,605,721 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 3605721 can be evenly divided by 1 3 7 21 103 309 721 1,667 2,163 5,001 11,669 35,007 171,701 515,103 1,201,907 and 3,605,721, with no remainder.
Since 3,605,721 cannot be divided by just 1 and 3,605,721, it is not a prime number.