0
To find the digital root of a number, repeatedly add its digits (called "digit sum") until you're left with a 1-digit number, 1 thru 9; e.g., 19 (a Prime number) = 1+9 = 10 = 1+0 = 1, i.e., the digital root of 19 is 1 [sometimes expressed as 19=dr(1)]. Here's one more example, 89 (a prime) = 8+9 = 17 = 1+7 = dr(8).
Add your answer:
Earn +20 pts
What are the two numbers which cannot be digital roots of prime numbers?
6 and 9.
What is prime with cube roots?
All numbers have cube roots (not necessarily integral cube roots) so every prime has cube roots.
What are prime numbers with square roots between 4 and 5?
The prime numbers with square roots between 4 and 5 are 5 and 7.
Is there any prime numbers that are square numbers?
No, there are no prime numbers that are also square numbers. Prime numbers are only divisible by 1 and themselves, while square numbers have integer square roots. Since the square root of a prime number is not an integer, a prime number cannot be a square number.
Can every square root be simplified?
No. For example, the square roots of prime numbers cannot be simplified.
What are the two numbers which cannot be digital roots of prime numbers?
6 and 9.
What is prime with cube roots?
All numbers have cube roots (not necessarily integral cube roots) so every prime has cube roots.
What are prime numbers with square roots between 4 and 5?
The prime numbers with square roots between 4 and 5 are 5 and 7.
Why are the square roots of prime numbers greater than one always rational?
They aren't. The square roots of prime numbers are always irrational.
Is the square root of 19 a rational number?
No. 19 is a prime number, and all prime numbers have irrational roots.
Is there any prime numbers that are square numbers?
No, there are no prime numbers that are also square numbers. Prime numbers are only divisible by 1 and themselves, while square numbers have integer square roots. Since the square root of a prime number is not an integer, a prime number cannot be a square number.
What prime numbers have square roots between 4 and 5?
17 19 23
Can every square root be simplified?
No. For example, the square roots of prime numbers cannot be simplified.
How do you know that 59 and 89 are prime numbers?
59 and 89 are prime numbers because they have exactly two factors, 1 and the number itself. Another test is that they are not evenly divisible by 2, 3, 5, or 7, which are the only prime numbers smaller than their square roots.
Why is the calculator important?
Without it you wouldn't be able to find the square roots of prime numbers.
What is the largest prime number that has a square root that is less than 20?
Prime numbers can't have whole number square roots, of course, but the largest prime number under 400 is 397.
What do 4 9 25 and 49 have in common?
Each of their square roots are prime numbers and each have only 3 factors
