Q: Is 3,967,821 a Prime Number?
A: No, 3,967,821 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 3967821 can be evenly divided by 1 3 9 11 13 33 39 99 117 143 429 1,287 3,083 9,249 27,747 33,913 40,079 101,739 120,237 305,217 360,711 440,869 1,322,607 and 3,967,821, with no remainder.
Since 3,967,821 cannot be divided by just 1 and 3,967,821, it is not a prime number.