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2 is the exception to the rule that every Prime number is odd
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Is there any rule to know if a number is prime?
Yes. Try dividing the number by every prime number up to its square root. If none of these divide the number evenly then it is a prime.
How Many Prime Numbers are Odd?
Infinite. All prime numbers are odd with the exception of 2. Prime numbers are only divisible by 1 and themselves. That's the rule. The only prime number that is even is 2 since all other even numbers are divisible by 2 also. Hence all prime numbers are odd with the exception of 2.
What is the rule for this sequence 3 4 6 9 13 18?
The rule for this sequence appears to be adding consecutive prime numbers. The sequence starts with 3, then adds the next prime number 2 to get 4. It then adds 3 (the next prime number) to 4 to get 7, then 5 to 7 to get 12, and so on. Each number in the sequence is the sum of the previous number and the next prime number in order.
Is 429 a prime number?
I Dont know if this is for prime's or not but i can remember doing this thing. you add up the numbers of the digit ( 4+2+9=15) Then You see if 15 is a prime then you have the answer. ================================ 429 = 3*11*13. Hence, it is not a prime number. A comment on the first author's response: 37 is a prime number. The sum of 3 and 7 is 10. Ten is not a prime number. Hence the rule does not apply universally. The rule does not apply to 11, 13, ,17, or 19, all known prime numbers, either. I find the related link to be useful. ================================
What number follows every divisible rule through 1-10?
11
