It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 420 478 is not a prime number.
For example, 420 478 can be divided by 2: 420 478 / 2 = 210 239.
For 420 478 to be a prime number, it would have been required that 420 478 has only two divisors, i.e., itself and 1.
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420 478 is an even number, because it is evenly divisible by 2: 420 478 / 2 = 210 239.
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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 420 478 is about 648.443.
Thus, the square root of 420 478 is not an integer, and therefore 420 478 is not a square number.
The square of a number (here 420 478) is the result of the product of this number (420 478) by itself (i.e., 420 478 × 420 478); the square of 420 478 is sometimes called "raising 420 478 to the power 2", or "420 478 squared".
The square of 420 478 is 176 801 748 484 because 420 478 × 420 478 = 420 4782 = 176 801 748 484.
As a consequence, 420 478 is the square root of 176 801 748 484.
The multiples of 420 478 are all integers evenly divisible by 420 478, that is all numbers such that the remainder of the division by 420 478 is zero. There are infinitely many multiples of 420 478. The smallest multiples of 420 478 are: