It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 421 502 is not a prime number.
For example, 421 502 can be divided by 2: 421 502 / 2 = 210 751.
For 421 502 to be a prime number, it would have been required that 421 502 has only two divisors, i.e., itself and 1.
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421 502 is an even number, because it is evenly divisible by 2: 421 502 / 2 = 210 751.
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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 421 502 is about 649.232.
Thus, the square root of 421 502 is not an integer, and therefore 421 502 is not a square number.
The square of a number (here 421 502) is the result of the product of this number (421 502) by itself (i.e., 421 502 × 421 502); the square of 421 502 is sometimes called "raising 421 502 to the power 2", or "421 502 squared".
The square of 421 502 is 177 663 936 004 because 421 502 × 421 502 = 421 5022 = 177 663 936 004.
As a consequence, 421 502 is the square root of 177 663 936 004.
The multiples of 421 502 are all integers evenly divisible by 421 502, that is all numbers such that the remainder of the division by 421 502 is zero. There are infinitely many multiples of 421 502. The smallest multiples of 421 502 are: