It is possible to find out using mathematical methods whether a given integer is a prime number or not.
No, 420 142 is not a prime number.
For example, 420 142 can be divided by 2: 420 142 / 2 = 210 071.
For 420 142 to be a prime number, it would have been required that 420 142 has only two divisors, i.e., itself and 1.
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420 142 is an even number, because it is evenly divisible by 2: 420 142 / 2 = 210 071.
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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 420 142 is about 648.184.
Thus, the square root of 420 142 is not an integer, and therefore 420 142 is not a square number.
The square of a number (here 420 142) is the result of the product of this number (420 142) by itself (i.e., 420 142 × 420 142); the square of 420 142 is sometimes called "raising 420 142 to the power 2", or "420 142 squared".
The square of 420 142 is 176 519 300 164 because 420 142 × 420 142 = 420 1422 = 176 519 300 164.
As a consequence, 420 142 is the square root of 176 519 300 164.
The multiples of 420 142 are all integers evenly divisible by 420 142, that is all numbers such that the remainder of the division by 420 142 is zero. There are infinitely many multiples of 420 142. The smallest multiples of 420 142 are: