2007-10-19 10:29:58 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
No. 3*17 = 51
So 51 has 4 factors: 1, 3, 17, and 51
2007-10-19 10:33:00 · answer #1 · answered by math guy 6 · 7⤊ 1⤋
Is 51 A Prime Number
2016-10-08 04:56:44 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Is 51 Prime
2016-12-13 09:44:30 · answer #3 · answered by ? 4 · 0⤊ 0⤋
An earlier comment stated: "here is a little trick i use to figure out if its prime or not. when i see an odd number, such as 51, i add the digits, and then i see if its divisible by three. If it is then it is NOT prime. "
That is partially incorrect.
For example, if I wanted to know if 91 was a prime number, I'd think 9+1=10 and 10 is not divisible by 3 so it must be a prime number. WRONG!
It is important that if you use this trick, you check to see if it is divisible by ANY prime number so 3, 5, 7, etc. Lets try it again using this new information, 9+1 =10, is 10 divisible by any prime number? Yes, 5!
So 91 is NOT A PRIME NUMBER not because 9+1=10 and 10 can be divided by the prime number 5.
2013-12-14 12:38:56 · answer #4 · answered by Anonymous · 2⤊ 0⤋
No. 51 = 17*3.
Note that the sum of the digits of 51 is 6, a multiple of 3.
That means 51 is divisible by 3.
2007-10-19 15:09:44 · answer #5 · answered by steiner1745 7 · 2⤊ 0⤋
This Site Might Help You.
RE:
Is 51 prime?
2015-02-03 04:16:51 · answer #6 · answered by Anonymous · 0⤊ 0⤋
No...
3*17 = 51...
2007-10-19 10:33:35 · answer #7 · answered by sayamiam 6 · 1⤊ 0⤋
No!! Prime numbers are those numbers that are only divisible by the number 1 and the number itself...i.e...1, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43..etc...etc...
2007-10-19 10:39:27 · answer #8 · answered by Anonymous · 0⤊ 3⤋
no it is not.
here is a little trick i use to figure out if its prime or not. when i see an odd number, such as 51, i add the digits, and then i see if its divisible by three. If it is then it is NOT prime.
and if you have an even number you know it is NOT prime because all even numbers can be divisible by two.
=]
2007-10-19 10:36:09 · answer #9 · answered by Kandi :P 3 · 9⤊ 3⤋
NO! You can see it yourself if you divide 1,2,3,4,5,6... and then you can see the factors on the answer spot on the division problem. You stop when the divisor and the answer are the same on the last 2 problems.
2015-10-06 06:00:36 · answer #10 · answered by ? 1 · 0⤊ 0⤋