Q: Is 1,621,512 a Prime Number?
A: No, 1,621,512 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 1621512 can be evenly divided by 1 2 3 4 6 8 9 12 18 24 27 36 54 72 108 216 7,507 15,014 22,521 30,028 45,042 60,056 67,563 90,084 135,126 180,168 202,689 270,252 405,378 540,504 810,756 and 1,621,512, with no remainder.
Since 1,621,512 cannot be divided by just 1 and 1,621,512, it is not a prime number.