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It used to be considered a Prime number. There are several reasons why it is normally not considered a prime number nowadays; one of them is because, if it is counted as a prime number, the factoring of numbers isn't unique.

For example, 15 = 3 x 5; that's the only way to factor 15, but if you include 1 as a possible factor, you can factor 15 as 3 x 5, 1 x 3 x 5, 1 x 1 x 3 x 5, 13 x 3 x 5, etc.

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Q: Why do you think mathematicians decided not to call 1 a prime number?
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Why did mathematicians decide that 1 not a prime number?

because a prime number is 1 and itself and we dont use 1 times one... ( i think)


Why do you think that the mathematicians decide not to call 1 a prime number?

Because it can be multiplied by any number 1x2=2 1x3=3 x14=4 1x5=5 1x6=6 1x7=7 hope this helped. A prime number is a number that can only be divided by one and itself. A prime number can therefore be divided by two numbers. In the case of the number one it can only be divided by one number.


Why do you think mathmaticians decided not to call 1 a prime number?

A prime number has two factors, 1 and itself. 1 is not considered a prime number as its factors are 1. Following the rule for primes, you could say that its factors are 1 and 1, but 1 and 1 are obviously the same number.


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