It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 423 402 is not a prime number.
For example, 423 402 can be divided by 2: 423 402 / 2 = 211 701.
For 423 402 to be a prime number, it would have been required that 423 402 has only two divisors, i.e., itself and 1.
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423 402 is an even number, because it is evenly divisible by 2: 423 402 / 2 = 211 701.
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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 423 402 is about 650.693.
Thus, the square root of 423 402 is not an integer, and therefore 423 402 is not a square number.
The square of a number (here 423 402) is the result of the product of this number (423 402) by itself (i.e., 423 402 × 423 402); the square of 423 402 is sometimes called "raising 423 402 to the power 2", or "423 402 squared".
The square of 423 402 is 179 269 253 604 because 423 402 × 423 402 = 423 4022 = 179 269 253 604.
As a consequence, 423 402 is the square root of 179 269 253 604.
The multiples of 423 402 are all integers evenly divisible by 423 402, that is all numbers such that the remainder of the division by 423 402 is zero. There are infinitely many multiples of 423 402. The smallest multiples of 423 402 are: