Q: Is 7,840 a Prime Number?
A: No, 7,840 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 7840 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 28 32 35 40 49 56 70 80 98 112 140 160 196 224 245 280 392 490 560 784 980 1,120 1,568 1,960 3,920 and 7,840, with no remainder.
Since 7,840 cannot be divided by just 1 and 7,840, it is not a prime number.