Q: Is 3,987,820 a Prime Number?
A: No, 3,987,820 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 3987820 can be evenly divided by 1 2 4 5 10 20 43 86 172 215 430 860 4,637 9,274 18,548 23,185 46,370 92,740 199,391 398,782 797,564 996,955 1,993,910 and 3,987,820, with no remainder.
Since 3,987,820 cannot be divided by just 1 and 3,987,820, it is not a prime number.