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Why is 143 not a prime number?

Answer

A prime number is a positive integer that has exactly two positive integer factors. 1 and itself. 11 x 13 =143 ,so 143 is not a prime number.
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Prime numbers had been a long held theory for all known history however Eratosthenes is credited for prime numbers in 240 BC though later in history prime numbers developed more.
http://answers.ask.com/Science/Mathematics/who_inv...
No 2 prime numbers add up to 143 x + y = 143 Assuming x and y are integers: If x is odd, y must be even The only even prime is 2 143 - 2 = 141 x = 141 But 141 = 3×47 and so
http://answers.yahoo.com/question/index?qid=200805...
1. There are an infinite number of primes. Everyone is familiar with small primes like 5, 11, and 13, but since ancient times mathematicians have known that there is no such thing
http://www.ehow.com/how_2027230_prime-numbers.html
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The prime factorization of 143 is 11 x 13. That is because of all the factors of 143 (1, 11, 13, 143) only the number 11 and the number 13 is prime number. ...
No, 1001 is not a prime number. The factors of 1001 are 1, 7 11, 13, 77, 91, 143 and 1001. To be a prime number is would only have two factors, 1 and 1001. ...
The number 143 is an acronym, slang or abbreviation that means 'I love you'. Each number represents letters in each word. For instance the number 1 represent ' ...
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