Q: Is 405,840 a Composite Number?

Why is 405,840 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 405,840 can be evenly divided by 1 2 3 4 5 6 8 10 12 15 16 19 20 24 30 38 40 48 57 60 76 80 89 95 114 120 152 178 190 228 240 267 285 304 356 380 445 456 534 570 712 760 890 912 1,068 1,140 1,335 1,424 1,520 1,691 1,780 2,136 2,280 2,670 3,382 3,560 4,272 4,560 5,073 5,340 6,764 7,120 8,455 10,146 10,680 13,528 16,910 20,292 21,360 25,365 27,056 33,820 40,584 50,730 67,640 81,168 101,460 135,280 202,920 and 405,840, with no remainder.

Since 405,840 cannot be divided by just 1 and 405,840, 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).