It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 720 421 is not a prime number.
For example, 720 421 can be divided by 13: 720 421 / 13 = 55 417.
For 720 421 to be a prime number, it would have been required that 720 421 has only two divisors, i.e., itself and 1.
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720 421 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 720 421 is about 848.776.
Thus, the square root of 720 421 is not an integer, and therefore 720 421 is not a square number.
The square of a number (here 720 421) is the result of the product of this number (720 421) by itself (i.e., 720 421 × 720 421); the square of 720 421 is sometimes called "raising 720 421 to the power 2", or "720 421 squared".
The square of 720 421 is 519 006 417 241 because 720 421 × 720 421 = 720 4212 = 519 006 417 241.
As a consequence, 720 421 is the square root of 519 006 417 241.
The multiples of 720 421 are all integers evenly divisible by 720 421, that is all numbers such that the remainder of the division by 720 421 is zero. There are infinitely many multiples of 720 421. The smallest multiples of 720 421 are: