Q: Is 1,641,720 a Prime Number?
A: No, 1,641,720 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 1641720 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 20 24 30 40 60 120 13,681 27,362 41,043 54,724 68,405 82,086 109,448 136,810 164,172 205,215 273,620 328,344 410,430 547,240 820,860 and 1,641,720, with no remainder.
Since 1,641,720 cannot be divided by just 1 and 1,641,720, it is not a prime number.