Q: Is 1,601,644 a Prime Number?
A: No, 1,601,644 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 1601644 can be evenly divided by 1 2 4 11 22 44 89 178 356 409 818 979 1,636 1,958 3,916 4,499 8,998 17,996 36,401 72,802 145,604 400,411 800,822 and 1,601,644, with no remainder.
Since 1,601,644 cannot be divided by just 1 and 1,601,644, it is not a prime number.