Q: Is 421,408 a Prime Number?
A: No, 421,408 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 421408 can be evenly divided by 1 2 4 8 13 16 26 32 52 104 208 416 1,013 2,026 4,052 8,104 13,169 16,208 26,338 32,416 52,676 105,352 210,704 and 421,408, with no remainder.
Since 421,408 cannot be divided by just 1 and 421,408, it is not a prime number.