Q: Is 280,000 a Prime Number?
A: No, 280,000 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 280000 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 25 28 32 35 40 50 56 64 70 80 100 112 125 140 160 175 200 224 250 280 320 350 400 448 500 560 625 700 800 875 1,000 1,120 1,250 1,400 1,600 1,750 2,000 2,240 2,500 2,800 3,500 4,000 4,375 5,000 5,600 7,000 8,000 8,750 10,000 11,200 14,000 17,500 20,000 28,000 35,000 40,000 56,000 70,000 140,000 and 280,000, with no remainder.
Since 280,000 cannot be divided by just 1 and 280,000, it is not a prime number.