Q: Is 421,820 a Prime Number?

 A: No, 421,820 is not a prime number.

Why is 421,820 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 421820 can be evenly divided by 1 2 4 5 7 10 14 20 23 28 35 46 70 92 115 131 140 161 230 262 322 460 524 644 655 805 917 1,310 1,610 1,834 2,620 3,013 3,220 3,668 4,585 6,026 9,170 12,052 15,065 18,340 21,091 30,130 42,182 60,260 84,364 105,455 210,910 and 421,820, with no remainder.

Since 421,820 cannot be divided by just 1 and 421,820, it is not a prime number.


More Examples

Number 421,818421,819421,821421,822
Prime? nononono
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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