# 51 is Prime: What Exactly Means a Number to be “Prime”?

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Prime numbers are a special type of number that is only divisible by one and itself. The number 51 is prime because it is the product of two consecutive numbers- it is the sum of 50, and 1. This means that there is no other integer (a whole number) that can divide evenly into both factors to make an even whole, like 25 divides evenly into 5 and 5.

In this blog post we will explore what exactly makes a number prime, why this matters in math, how to find out if your favorite numbers are prime or not with a fun little tool I’ve created just for you!

Why is 51 a prime number?

Prime numbers are special because they only have divisors of one and themselves. This means that there is no other integer (a whole number) that can divide evenly into both factors to make an even whole, like 25 divides evenly into five and five. In the case of the example above- in which two consecutive numbers give you 50+ 51= 101- it is clear that not all integers can be divided by either factor. To prove this for yourself, try dividing each possible answer with every single positive integer up to 100:

25/50 is 0; 25/51 is 0; 26/? ?not prime! 27/50 is 0; 27/51 is negative (-0.693); 28/? is not prime! 29/50 is 0; 29/51 is negative (-0.696)

30/? is not prime! 31? is marginal (prime!)

The number 51 is a prime because it only has divisors of one and itself, which the other numbers listed do not. The number 59 is also a perfect example of this: no integer can divide evenly into both factors to make an even whole except for two consecutive integers that give you 60+61=121. You cannot really go any higher with these examples because there are practical limits on how high we can count in base ten notation or remember offhand. Try dividing each possible answer with every single positive integer up to 100 again: is 51 a prime number

is 66 not prime? is 67 not prime? is 68 not prime? is 69 not prime? is 70 not prime? is 71 primes.

72/? ?not prim! 73/50 is 0; 73/51 is negative (-0.697); 74/? is no tprime! 75/50 is 0; 75/51 (+0) 76, 77, 78, 79 are all also divisible by three and so are still “non-primes.” 80?, 81?, 82?, 83, 84…? 85: now we have to get into the “marginal” category again because 86=71*(x+y). 87: 88=/77*(u+v). 89 is divisible by eleven and is not a prime number.

is 91, 92?, 93?…94: 95=/92*(x+y). 96 is divisible by fifteen and is not a prime number. 97 is divisible by nineteen ans so is also “non-primes.” 98 – 100 are all at the edge of being too high to be practical either for base ten or even remembering offhand which means they will never really have an answer that can be proven one way or another as easily as it can with 51!

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is 51 a prime number?

Blog post content: If we have to get into the “marginal category again because 86=71*(x+y). 87: 88=/77*(u+v).” 89 is divisible by eleven and is not a prime number. 91 – 100 are all too high for practical use, which means they will never really have an answer that can be proven one way or another as easily as it can with 51! Check back soon for updates on how to continue writing this blog posts!

If you want me to write them for you, then email me at [email protected]!

is 51 a prime number, why is 76 not divisible by any other numbers besides one and itself. Blog post content: If we have to get into the “marginal category” again because 86=71*(x+y). 87: 88=/77*(u+v).” 89 is divisible by eleven and is not a prime number. 91 – 100 are all too high for practical use, which means they will never really have an answer that can be proven one way or another as easily as it can with 51! Check back soon for updates on how to continue writing this blog posts!