It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 708 421 is not a prime number.
For example, 708 421 can be divided by 7: 708 421 / 7 = 101 203.
For 708 421 to be a prime number, it would have been required that 708 421 has only two divisors, i.e., itself and 1.
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708 421 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 708 421 is about 841.677.
Thus, the square root of 708 421 is not an integer, and therefore 708 421 is not a square number.
The square of a number (here 708 421) is the result of the product of this number (708 421) by itself (i.e., 708 421 × 708 421); the square of 708 421 is sometimes called "raising 708 421 to the power 2", or "708 421 squared".
The square of 708 421 is 501 860 313 241 because 708 421 × 708 421 = 708 4212 = 501 860 313 241.
As a consequence, 708 421 is the square root of 501 860 313 241.
The multiples of 708 421 are all integers evenly divisible by 708 421, that is all numbers such that the remainder of the division by 708 421 is zero. There are infinitely many multiples of 708 421. The smallest multiples of 708 421 are: