Q: Is 215,840 a Prime Number?
A: No, 215,840 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 215840 can be evenly divided by 1 2 4 5 8 10 16 19 20 32 38 40 71 76 80 95 142 152 160 190 284 304 355 380 568 608 710 760 1,136 1,349 1,420 1,520 2,272 2,698 2,840 3,040 5,396 5,680 6,745 10,792 11,360 13,490 21,584 26,980 43,168 53,960 107,920 and 215,840, with no remainder.
Since 215,840 cannot be divided by just 1 and 215,840, it is not a prime number.