It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 238 513 is not a prime number.
For example, 1 238 513 can be divided by 1 097: 1 238 513 / 1097 = 1 129.
For 1 238 513 to be a prime number, it would have been required that 1 238 513 has only two divisors, i.e., itself and 1.
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1 238 513 is an odd number, because it is not evenly divisible by 2.
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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 1 238 513 is about 1 112.885.
Thus, the square root of 1 238 513 is not an integer, and therefore 1 238 513 is not a square number.
The square of a number (here 1 238 513) is the result of the product of this number (1 238 513) by itself (i.e., 1 238 513 × 1 238 513); the square of 1 238 513 is sometimes called "raising 1 238 513 to the power 2", or "1 238 513 squared".
The square of 1 238 513 is 1 533 914 451 169 because 1 238 513 × 1 238 513 = 1 238 5132 = 1 533 914 451 169.
As a consequence, 1 238 513 is the square root of 1 533 914 451 169.
The multiples of 1 238 513 are all integers evenly divisible by 1 238 513, that is all numbers such that the remainder of the division by 1 238 513 is zero. There are infinitely many multiples of 1 238 513. The smallest multiples of 1 238 513 are: