Q: Is 123,820 a Prime Number?

A: No, 123,820 is not a prime number.

Why is 123,820 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 123820 can be evenly divided by 1 2 4 5 10 20 41 82 151 164 205 302 410 604 755 820 1,510 3,020 6,191 12,382 24,764 30,955 61,910 and 123,820, with no remainder.

Since 123,820 cannot be divided by just 1 and 123,820, it is not a prime number.

Number	123,818	123,819	123,821	123,822
Prime?	no	no	yes	no

All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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