Q: Is 787,840 a Prime Number?
A: No, 787,840 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 787840 can be evenly divided by 1 2 4 5 8 10 16 20 32 40 64 80 128 160 320 640 1,231 2,462 4,924 6,155 9,848 12,310 19,696 24,620 39,392 49,240 78,784 98,480 157,568 196,960 393,920 and 787,840, with no remainder.
Since 787,840 cannot be divided by just 1 and 787,840, it is not a prime number.