Q: Is 778,400 a Prime Number?
A: No, 778,400 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 778400 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 25 28 32 35 40 50 56 70 80 100 112 139 140 160 175 200 224 278 280 350 400 556 560 695 700 800 973 1,112 1,120 1,390 1,400 1,946 2,224 2,780 2,800 3,475 3,892 4,448 4,865 5,560 5,600 6,950 7,784 9,730 11,120 13,900 15,568 19,460 22,240 24,325 27,800 31,136 38,920 48,650 55,600 77,840 97,300 111,200 155,680 194,600 389,200 and 778,400, with no remainder.
Since 778,400 cannot be divided by just 1 and 778,400, it is not a prime number.