Q: Is 121,123,128 a Prime Number?

 A: No, 121,123,128 is not a prime number.

Why is 121,123,128 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 121123128 can be evenly divided by 1 2 3 4 6 7 8 12 14 21 24 28 42 56 84 168 720,971 1,441,942 2,162,913 2,883,884 4,325,826 5,046,797 5,767,768 8,651,652 10,093,594 15,140,391 17,303,304 20,187,188 30,280,782 40,374,376 60,561,564 and 121,123,128, with no remainder.

Since 121,123,128 cannot be divided by just 1 and 121,123,128, it is not a prime number.


More Examples

Number 121,123,126121,123,127121,123,129121,123,130
Prime? noyesnono
  • All positive natural numbers are either a prime number or a composite number (except the number 1, which is neither).

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