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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).
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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.
