It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 421 702 is not a prime number.
For example, 421 702 can be divided by 2: 421 702 / 2 = 210 851.
For 421 702 to be a prime number, it would have been required that 421 702 has only two divisors, i.e., itself and 1.
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421 702 is an even number, because it is evenly divisible by 2: 421 702 / 2 = 210 851.
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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 421 702 is about 649.386.
Thus, the square root of 421 702 is not an integer, and therefore 421 702 is not a square number.
The square of a number (here 421 702) is the result of the product of this number (421 702) by itself (i.e., 421 702 × 421 702); the square of 421 702 is sometimes called "raising 421 702 to the power 2", or "421 702 squared".
The square of 421 702 is 177 832 576 804 because 421 702 × 421 702 = 421 7022 = 177 832 576 804.
As a consequence, 421 702 is the square root of 177 832 576 804.
The multiples of 421 702 are all integers evenly divisible by 421 702, that is all numbers such that the remainder of the division by 421 702 is zero. There are infinitely many multiples of 421 702. The smallest multiples of 421 702 are: