It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 402 is not a prime number.
For example, 720 402 can be divided by 2: 720 402 / 2 = 360 201.
For 720 402 to be a prime number, it would have been required that 720 402 has only two divisors, i.e., itself and 1.
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720 402 is an even number, because it is evenly divisible by 2: 720 402 / 2 = 360 201.
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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 720 402 is about 848.765.
Thus, the square root of 720 402 is not an integer, and therefore 720 402 is not a square number.
The square of a number (here 720 402) is the result of the product of this number (720 402) by itself (i.e., 720 402 × 720 402); the square of 720 402 is sometimes called "raising 720 402 to the power 2", or "720 402 squared".
The square of 720 402 is 518 979 041 604 because 720 402 × 720 402 = 720 4022 = 518 979 041 604.
As a consequence, 720 402 is the square root of 518 979 041 604.
The multiples of 720 402 are all integers evenly divisible by 720 402, that is all numbers such that the remainder of the division by 720 402 is zero. There are infinitely many multiples of 720 402. The smallest multiples of 720 402 are: