It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 242 is not a prime number.
For example, 720 242 can be divided by 2: 720 242 / 2 = 360 121.
For 720 242 to be a prime number, it would have been required that 720 242 has only two divisors, i.e., itself and 1.
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720 242 is an even number, because it is evenly divisible by 2: 720 242 / 2 = 360 121.
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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 720 242 is about 848.671.
Thus, the square root of 720 242 is not an integer, and therefore 720 242 is not a square number.
The square of a number (here 720 242) is the result of the product of this number (720 242) by itself (i.e., 720 242 × 720 242); the square of 720 242 is sometimes called "raising 720 242 to the power 2", or "720 242 squared".
The square of 720 242 is 518 748 538 564 because 720 242 × 720 242 = 720 2422 = 518 748 538 564.
As a consequence, 720 242 is the square root of 518 748 538 564.
The multiples of 720 242 are all integers evenly divisible by 720 242, that is all numbers such that the remainder of the division by 720 242 is zero. There are infinitely many multiples of 720 242. The smallest multiples of 720 242 are: