It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 420 496 018 is not a prime number.
For example, 420 496 018 can be divided by 2: 420 496 018 / 2 = 210 248 009.
For 420 496 018 to be a prime number, it would have been required that 420 496 018 has only two divisors, i.e., itself and 1.
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420 496 018 is an even number, because it is evenly divisible by 2: 420 496 018 / 2 = 210 248 009.
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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 420 496 018 is about 20 506.000.
Thus, the square root of 420 496 018 is not an integer, and therefore 420 496 018 is not a square number.
The square of a number (here 420 496 018) is the result of the product of this number (420 496 018) by itself (i.e., 420 496 018 × 420 496 018); the square of 420 496 018 is sometimes called "raising 420 496 018 to the power 2", or "420 496 018 squared".
The square of 420 496 018 is 176 816 901 153 856 320 because 420 496 018 × 420 496 018 = 420 496 0182 = 176 816 901 153 856 320.
As a consequence, 420 496 018 is the square root of 176 816 901 153 856 320.
420 496 018 is a number with 9 digits.
The multiples of 420 496 018 are all integers evenly divisible by 420 496 018, that is all numbers such that the remainder of the division by 420 496 018 is zero. There are infinitely many multiples of 420 496 018. The smallest multiples of 420 496 018 are: