Any number which can be represented in the form of ab or cab, where a, b and c are integers and b ≠ 0, is a rational number.

A non-terminating and repeating decimal is also a rational number.

So, 814 is a rational number.

400324 = 20 × 2018 × 18

= 2018 = 109, is a rational number.

63 = (9 × 7) = 9 × 7 = 37

3 is a rational number, but 7 is an irrational number.

So, the product 37 is an irrational number.

Irrational numbers are real numbers that cannot be expressed as fractions, terminating decimals, or repeating decimals

The value of 35 = 0.6.

The value of 2 = 1.41421356 .......

The value of 210 = 0.2

The value of 25 = 5

Among the choices given , only 2 is an irrational number.

Irrational numbers are real numbers that cannot be expressed as fractions, terminating decimals, or repeating.

Among the choices, 56 = 9.1666...

32 = 1.5

38 = 0.375

So, none of the above is the answer.

Irrational numbers are real numbers that cannot be expressed as fractions, terminating decimals, or repeating decimals

The value of 196 = 14

The value of 38 = 0.375

The value of 125 = 2.4

The value of 65 = 8.062...

Among the choices given, only 65 is an irrational number

A rational number is the ratio of two integers in the form ab, where b ≠ 0.

Natural numbers are {1, 2, 3, ...}.

437.54 is a decimal number and a rational number.

- 25 is a negative rational number.

139 = 1.4444....is a repeating decimal number and a rational number.

753 = 25 is a natural number and a rational number.

Amongst the choices, 753 is the rational number and a natural number.

An irrrational number is a number which cannot be written as a quotient of two integers.

625 = 25 and 13.5 = 544

38 is not a perfect square, so 38 cannot be expressed as a quotient of two integers.

And 38 = 6.164414002968..., which is a non-terminating and non-repeating decimal.

So, 38 is an irrational number.

- 4.7513... is a non-terminating and a non-repeating decimal number, so it is not a rational number.

- 49 = - 7 is a rational number and also an integer.

66 cannot be expressed as a quotient of two integers, so it is not a rational number.

20.4 = 1025 is a rational number, but not an integer.

310 and 35 are rational numbers. Becasue, 310 = 0.3 and 35 = 0.6 , terminating decimals.

36 = 62 = 6, which is a rational number.

3 = 1.732050807568877..., which is a non-terminating and non-repeating decimal.

So, 3 is an irrational number.

An irrational number is a non-terminating and non-repeating decimal.

58 = 0.625, 111 = 0.0909091..., are the rational numbers.

0.98 is a terminating decimal.

11 = 3.31662..., which is a non-terminating and non-repeating decimal.

11 is an irrational number.

An irrrational number is a number which cannot be written as a quotient of two integers.

625 = 25 and 13.5 = 544

38 is not a perfect square, so 38 cannot be expressed as a quotient of two integers.

And 38 = 6.164414002968..., which is a non-terminating and non-repeating decimal.

So, 38 is an irrational number.