Q: Is 398,240 a Prime Number?
A: No, 398,240 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 398240 can be evenly divided by 1 2 4 5 8 10 16 19 20 32 38 40 76 80 95 131 152 160 190 262 304 380 524 608 655 760 1,048 1,310 1,520 2,096 2,489 2,620 3,040 4,192 4,978 5,240 9,956 10,480 12,445 19,912 20,960 24,890 39,824 49,780 79,648 99,560 199,120 and 398,240, with no remainder.
Since 398,240 cannot be divided by just 1 and 398,240, it is not a prime number.