Q: Is 21,331,520 a Composite Number?

Why is 21,331,520 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 21,331,520 can be evenly divided by 1 2 4 5 7 8 10 14 16 20 28 32 35 40 56 64 70 80 89 107 112 140 160 178 214 224 280 320 356 428 445 448 535 560 623 712 749 856 890 1,070 1,120 1,246 1,424 1,498 1,712 1,780 2,140 2,240 2,492 2,848 2,996 3,115 3,424 3,560 3,745 4,280 4,984 5,696 5,992 6,230 6,848 7,120 7,490 8,560 9,523 9,968 11,984 12,460 14,240 14,980 17,120 19,046 19,936 23,968 24,920 28,480 29,960 34,240 38,092 39,872 47,615 47,936 49,840 59,920 66,661 76,184 95,230 99,680 119,840 133,322 152,368 190,460 199,360 239,680 266,644 304,736 333,305 380,920 533,288 609,472 666,610 761,840 1,066,576 1,333,220 1,523,680 2,133,152 2,666,440 3,047,360 4,266,304 5,332,880 10,665,760 and 21,331,520, with no remainder.

Since 21,331,520 cannot be divided by just 1 and 21,331,520, 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).