Q: Is 421,890 a Prime Number?
A: No, 421,890 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 421890 can be evenly divided by 1 2 3 5 6 7 10 14 15 21 30 35 41 42 49 70 82 98 105 123 147 205 210 245 246 287 294 343 410 490 574 615 686 735 861 1,029 1,230 1,435 1,470 1,715 1,722 2,009 2,058 2,870 3,430 4,018 4,305 5,145 6,027 8,610 10,045 10,290 12,054 14,063 20,090 28,126 30,135 42,189 60,270 70,315 84,378 140,630 210,945 and 421,890, with no remainder.
Since 421,890 cannot be divided by just 1 and 421,890, it is not a prime number.