It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 240 349 is not a prime number.
For example, 1 240 349 can be divided by 11: 1 240 349 / 11 = 112 759.
For 1 240 349 to be a prime number, it would have been required that 1 240 349 has only two divisors, i.e., itself and 1.
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1 240 349 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 1 240 349 is about 1 113.710.
Thus, the square root of 1 240 349 is not an integer, and therefore 1 240 349 is not a square number.
The square of a number (here 1 240 349) is the result of the product of this number (1 240 349) by itself (i.e., 1 240 349 × 1 240 349); the square of 1 240 349 is sometimes called "raising 1 240 349 to the power 2", or "1 240 349 squared".
The square of 1 240 349 is 1 538 465 641 801 because 1 240 349 × 1 240 349 = 1 240 3492 = 1 538 465 641 801.
As a consequence, 1 240 349 is the square root of 1 538 465 641 801.
The multiples of 1 240 349 are all integers evenly divisible by 1 240 349, that is all numbers such that the remainder of the division by 1 240 349 is zero. There are infinitely many multiples of 1 240 349. The smallest multiples of 1 240 349 are: