Q: Is 81,900 a Composite Number?

Why is 81,900 a composite number?

A composite number is a number that can be divided evenly by more numbers than 1 and itself. It is the opposite of a prime number.

The number 81,900 can be evenly divided by 1 2 3 4 5 6 7 9 10 12 13 14 15 18 20 21 25 26 28 30 35 36 39 42 45 50 52 60 63 65 70 75 78 84 90 91 100 105 117 126 130 140 150 156 175 180 182 195 210 225 234 252 260 273 300 315 325 350 364 390 420 450 455 468 525 546 585 630 650 700 780 819 900 910 975 1,050 1,092 1,170 1,260 1,300 1,365 1,575 1,638 1,820 1,950 2,100 2,275 2,340 2,730 2,925 3,150 3,276 3,900 4,095 4,550 5,460 5,850 6,300 6,825 8,190 9,100 11,700 13,650 16,380 20,475 27,300 40,950 and 81,900, with no remainder.

Since 81,900 cannot be divided by just 1 and 81,900, it is a composite number.

More Examples

• All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).