Ruby determines whether a number is a prime number.

Ruby determines whether a number is a prime number.

Prime number. A natural number greater than 1 is called a union number if it cannot be divided by any other natural number except 1 and itself. According to the basic arithmetic theorem, each integer greater than 1 is either a prime number or a product of a series of prime numbers. If the order of these prime numbers in the product is not considered, the written form is unique.

Copy codeThe Code is as follows:
Def prime? (Num)
Res = [1]
Res <num

If num = 0 | num = 1
Return false
End

2. upto (10) do | x |
# If you have your own, you can skip a loop.
If num = x
Next
End

# Check whether the remainder can be divisible by a number between 2 and 10. The remainder is equivalent to a group.
If num % x = 0
Res <x
End
End

Res. length> 2? False: true
End