It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 420 242 is not a prime number.
For example, 420 242 can be divided by 2: 420 242 / 2 = 210 121.
For 420 242 to be a prime number, it would have been required that 420 242 has only two divisors, i.e., itself and 1.
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420 242 is an even number, because it is evenly divisible by 2: 420 242 / 2 = 210 121.
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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 420 242 is about 648.261.
Thus, the square root of 420 242 is not an integer, and therefore 420 242 is not a square number.
The square of a number (here 420 242) is the result of the product of this number (420 242) by itself (i.e., 420 242 × 420 242); the square of 420 242 is sometimes called "raising 420 242 to the power 2", or "420 242 squared".
The square of 420 242 is 176 603 338 564 because 420 242 × 420 242 = 420 2422 = 176 603 338 564.
As a consequence, 420 242 is the square root of 176 603 338 564.
The multiples of 420 242 are all integers evenly divisible by 420 242, that is all numbers such that the remainder of the division by 420 242 is zero. There are infinitely many multiples of 420 242. The smallest multiples of 420 242 are: