Q: Is 1,661,628 a Prime Number?
A: No, 1,661,628 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 1661628 can be evenly divided by 1 2 3 4 6 12 138,469 276,938 415,407 553,876 830,814 and 1,661,628, with no remainder.
Since 1,661,628 cannot be divided by just 1 and 1,661,628, it is not a prime number.