Q: Is 780,920 a Prime Number?
A: No, 780,920 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 780920 can be evenly divided by 1 2 4 5 7 8 10 14 20 28 35 40 56 70 140 280 2,789 5,578 11,156 13,945 19,523 22,312 27,890 39,046 55,780 78,092 97,615 111,560 156,184 195,230 390,460 and 780,920, with no remainder.
Since 780,920 cannot be divided by just 1 and 780,920, it is not a prime number.