Q: Is 21,418,880 a Composite Number?

Why is 21,418,880 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 21,418,880 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 28 32 35 40 49 56 64 70 80 98 112 128 140 160 196 224 245 280 320 392 448 490 560 640 683 784 896 980 1,120 1,366 1,568 1,960 2,240 2,732 3,136 3,415 3,920 4,480 4,781 5,464 6,272 6,830 7,840 9,562 10,928 13,660 15,680 19,124 21,856 23,905 27,320 31,360 33,467 38,248 43,712 47,810 54,640 66,934 76,496 87,424 95,620 109,280 133,868 152,992 167,335 191,240 218,560 267,736 305,984 334,670 382,480 437,120 535,472 611,968 669,340 764,960 1,070,944 1,338,680 1,529,920 2,141,888 2,677,360 3,059,840 4,283,776 5,354,720 10,709,440 and 21,418,880, with no remainder.

Since 21,418,880 cannot be divided by just 1 and 21,418,880, 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).