It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 338 424 is not a prime number.
For example, 1 338 424 can be divided by 2: 1 338 424 / 2 = 669 212.
For 1 338 424 to be a prime number, it would have been required that 1 338 424 has only two divisors, i.e., itself and 1.
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1 338 424 is an even number, because it is evenly divisible by 2: 1 338 424 / 2 = 669 212.
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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 1 338 424 is about 1 156.903.
Thus, the square root of 1 338 424 is not an integer, and therefore 1 338 424 is not a square number.
The square of a number (here 1 338 424) is the result of the product of this number (1 338 424) by itself (i.e., 1 338 424 × 1 338 424); the square of 1 338 424 is sometimes called "raising 1 338 424 to the power 2", or "1 338 424 squared".
The square of 1 338 424 is 1 791 378 803 776 because 1 338 424 × 1 338 424 = 1 338 4242 = 1 791 378 803 776.
As a consequence, 1 338 424 is the square root of 1 791 378 803 776.
The multiples of 1 338 424 are all integers evenly divisible by 1 338 424, that is all numbers such that the remainder of the division by 1 338 424 is zero. There are infinitely many multiples of 1 338 424. The smallest multiples of 1 338 424 are: