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How do you figure out whether 999919 is a prime number or not using only paper-pen calculations in few minutes?
Wiki User
∙ 14y ago
To test primality, you need to check whether the number is divisible by the prime numbers less than the integer part of its square root. I did it by noticing that 999,919 is almost 1,000,000 when I was determining what number would be close to its square root. The square root of 1,000,000 is 1,000. Then, since 999,919 is 1,000,000 - 81, it is one square number minus another: 1,0002 - 92. So, I know that 999,919 can be factored because of the Pythagorean theorem: a2 + b2 = c2, which can be rewritten as a2 = c2 - b2 = (c - b)(c + b). By substituting 999,919 for a2, 9 for b, and 1000 for c, I have 999,919 = (1000 - 9)(1000 + 9) = 991 x 1009. So, because 999,919 has factors other than 1 and itself, it cannot be a prime number.
Wiki User
∙ 14y ago
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How do you find factors of 999919?
Start with the prime factorization.991^1 x 1009^1Adding one to the exponents and multiplying gives you the number of factors.2 x 2 = 4999919 has four factors.Since you know that 1 and 999919 are factors, you have them all.All Factors of 999919:1, 991, 1009, 999919
A number of cats got together and decided to kill between them 999919 mice Every cat killed an equal number of mice Each cat killed more mice than there were cats How many cats do you think there w?
Find the factors of 999919 they are 991 and 1009ie 999919= 991* 1009 here it is said that the cat killed more mice than there were cats therefore the no of cats = 991
999919 divided by amount to get remainder 0?
Undefined: You cannot divide by zero
