It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 420 418 is not a prime number.
For example, 420 418 can be divided by 2: 420 418 / 2 = 210 209.
For 420 418 to be a prime number, it would have been required that 420 418 has only two divisors, i.e., itself and 1.
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420 418 is an even number, because it is evenly divisible by 2: 420 418 / 2 = 210 209.
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A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 420 418 is about 648.396.
Thus, the square root of 420 418 is not an integer, and therefore 420 418 is not a square number.
The square of a number (here 420 418) is the result of the product of this number (420 418) by itself (i.e., 420 418 × 420 418); the square of 420 418 is sometimes called "raising 420 418 to the power 2", or "420 418 squared".
The square of 420 418 is 176 751 294 724 because 420 418 × 420 418 = 420 4182 = 176 751 294 724.
As a consequence, 420 418 is the square root of 176 751 294 724.
The multiples of 420 418 are all integers evenly divisible by 420 418, that is all numbers such that the remainder of the division by 420 418 is zero. There are infinitely many multiples of 420 418. The smallest multiples of 420 418 are: