It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 1 242 721 is not a prime number.
For example, 1 242 721 can be divided by 491: 1 242 721 / 491 = 2 531.
For 1 242 721 to be a prime number, it would have been required that 1 242 721 has only two divisors, i.e., itself and 1.
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1 242 721 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 1 242 721 is about 1 114.774.
Thus, the square root of 1 242 721 is not an integer, and therefore 1 242 721 is not a square number.
The square of a number (here 1 242 721) is the result of the product of this number (1 242 721) by itself (i.e., 1 242 721 × 1 242 721); the square of 1 242 721 is sometimes called "raising 1 242 721 to the power 2", or "1 242 721 squared".
The square of 1 242 721 is 1 544 355 483 841 because 1 242 721 × 1 242 721 = 1 242 7212 = 1 544 355 483 841.
As a consequence, 1 242 721 is the square root of 1 544 355 483 841.
The multiples of 1 242 721 are all integers evenly divisible by 1 242 721, that is all numbers such that the remainder of the division by 1 242 721 is zero. There are infinitely many multiples of 1 242 721. The smallest multiples of 1 242 721 are: