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Class 10 > Why is the number 1 not considered a prime number?
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Why is the number 1 not considered a prime number?

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Maths and Computer Teacher

A prime number is that whose factors do not exists. As any number can be multiplied by 1, so 1 is a factor for that number. In other words, if 1 is considered as prime number, then no number can be called as prime number.
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For the needy

When you say all SQUARES are composite, 1 should not say "no I am prime!!" Right!? It has qualities of both prime and composite!
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Tutor

A number shud have 2 factors to name it as prime number. Number 1is having only 1factor that is the number itself. Hence it is not a prime number...
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Tutor

1 Is considered to be special number which is neither prime nor composite, This definition is given in std vii text book.
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Maths tutor

Because 1 is come in all tables like that all prime and composite number so that 1 is neither prime nor composite number.
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We can say that prime numbers are the building numbers for composite numbers.we can break down composite numbers inter factors of prime number where as we cannot do so in the case of number 1 hence it is said that it not composite nor prime
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Tutor

As 1 is associated with every number ,it is not taken as prime or composite number
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