Q: Is 28,000 a Prime Number?
A: No, 28,000 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 28000 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 25 28 32 35 40 50 56 70 80 100 112 125 140 160 175 200 224 250 280 350 400 500 560 700 800 875 1,000 1,120 1,400 1,750 2,000 2,800 3,500 4,000 5,600 7,000 14,000 and 28,000, with no remainder.
Since 28,000 cannot be divided by just 1 and 28,000, it is not a prime number.