It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 423 238 is not a prime number.
For example, 423 238 can be divided by 2: 423 238 / 2 = 211 619.
For 423 238 to be a prime number, it would have been required that 423 238 has only two divisors, i.e., itself and 1.
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423 238 is an even number, because it is evenly divisible by 2: 423 238 / 2 = 211 619.
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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 423 238 is about 650.567.
Thus, the square root of 423 238 is not an integer, and therefore 423 238 is not a square number.
The square of a number (here 423 238) is the result of the product of this number (423 238) by itself (i.e., 423 238 × 423 238); the square of 423 238 is sometimes called "raising 423 238 to the power 2", or "423 238 squared".
The square of 423 238 is 179 130 404 644 because 423 238 × 423 238 = 423 2382 = 179 130 404 644.
As a consequence, 423 238 is the square root of 179 130 404 644.
The multiples of 423 238 are all integers evenly divisible by 423 238, that is all numbers such that the remainder of the division by 423 238 is zero. There are infinitely many multiples of 423 238. The smallest multiples of 423 238 are: