Q: Is 421,780 a Prime Number?

 A: No, 421,780 is not a prime number.

Why is 421,780 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 421780 can be evenly divided by 1 2 4 5 10 20 21,089 42,178 84,356 105,445 210,890 and 421,780, with no remainder.

Since 421,780 cannot be divided by just 1 and 421,780, it is not a prime number.


More Examples

Number 421,778421,779421,781421,782
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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