It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 420 424 is not a prime number.
For example, 420 424 can be divided by 2: 420 424 / 2 = 210 212.
For 420 424 to be a prime number, it would have been required that 420 424 has only two divisors, i.e., itself and 1.
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420 424 is an even number, because it is evenly divisible by 2: 420 424 / 2 = 210 212.
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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 420 424 is about 648.401.
Thus, the square root of 420 424 is not an integer, and therefore 420 424 is not a square number.
The square of a number (here 420 424) is the result of the product of this number (420 424) by itself (i.e., 420 424 × 420 424); the square of 420 424 is sometimes called "raising 420 424 to the power 2", or "420 424 squared".
The square of 420 424 is 176 756 339 776 because 420 424 × 420 424 = 420 4242 = 176 756 339 776.
As a consequence, 420 424 is the square root of 176 756 339 776.
The multiples of 420 424 are all integers evenly divisible by 420 424, that is all numbers such that the remainder of the division by 420 424 is zero. There are infinitely many multiples of 420 424. The smallest multiples of 420 424 are: