Q: Is 3,645,621 a Prime Number?
A: No, 3,645,621 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 3645621 can be evenly divided by 1 3 7 9 21 27 63 189 19,289 57,867 135,023 173,601 405,069 520,803 1,215,207 and 3,645,621, with no remainder.
Since 3,645,621 cannot be divided by just 1 and 3,645,621, it is not a prime number.