Q: Is 42,780 a Prime Number?
A: No, 42,780 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 42780 can be evenly divided by 1 2 3 4 5 6 10 12 15 20 23 30 31 46 60 62 69 92 93 115 124 138 155 186 230 276 310 345 372 460 465 620 690 713 930 1,380 1,426 1,860 2,139 2,852 3,565 4,278 7,130 8,556 10,695 14,260 21,390 and 42,780, with no remainder.
Since 42,780 cannot be divided by just 1 and 42,780, it is not a prime number.