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Q: The number is less than 20 greater than 40 is not divisible by 2 3 or 7 is not a prime number the sum is not 8?

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25 is the number not less than 20, not greater than 40, not divisible by 2 3 or 7, and not a prime number.

Prime number greater than 25 but less than 30 is 29.

18

47 is the prime number greater than 43 and less than 52.

37

No. If you multiply two prime numbers, any prime numbers, the result will - by definition - not be a prime number. For example, if you multiply 2 x 3, the result will obviously be divisible by 2 and by 3, and therefore, not be a prime number. By the way, one is not usually considered a prime number.

Its square root is less than 9, but it is not evenly divisible by any number less than 9, other than 1, so it is a prime number

It could be 97 which is a prime number.

Prime number which is greater than 30 and less than 35 is 31.

49 is not prime, as it's 7 * 7.

To test for the factors of any prime number, you only need to test for numbers up to half of the number, because if the number is not divisible by 2, the next smallest number it would be divisible by is 1, which would make it a prime number.Similarly, there are no factors of any number greater than half of the original number, other than itself.Ans 2.Well, there is certainly no point in trying factors greater than half the number, just as explained above. On the other hand, there is no need to try numbers that big either. If you want to discover whether 1,000,001 is prime you do not need to try numbers up to 500,000; testing up to 997 looking for possible factors is sufficient. The rule is quite simple: try all primes that are less than the square root of the number you are researching. This works because if the target number is divisible by a number greater than its square root, it must also be divisible by a number less than its root.

89

There is no "the" prime number in that range - there are 21 of them. If you want "the" prime number you will need to be more specific.

No. To be divisible by a number it must be greater than, or equal to, that number. 10 is less than 66, so 10 cannot be divisible by 66.

16

27 is the prime number and also 41.

Prime numbers are such number which are only divisible by 1 and by itself only..{1,2,3,5,7,11,13,17}

85

No number meets these criteria. The number must be between 41 and 49. The only number in that range that is evenly divisible by 11 is 44, but 44 is even, not odd.

■31, 37,41,43

29 is the answer. 29 is prime. 2+9=11 which is prime. 9-2=7 which is prime.

64

If it is divisible by 2, 3, 5 or 7 then it is not prime. Otherwise it is.

Prime numbers, except 2, are always odd (they would not be prime if they were even cos they would be divisible by 2.) 1 less than any odd number must be an even number.

No. The 4 smallest primes are 2 3 5 7. Multiplying these gives 210. Note that 1 is not regarded as a prime no. If it were to be then no other number could be prime for all of them are divisible by 1.